chore: ditto for 'BUG REPORT'

.gitea/ISSUE_TEMPLATE/config.yml

@@ -1,2 +1,2 @@
 # yaml-language-server: $schema=https://www.schemastore.org/gitea-issue-config.json
-blank_issues_enabled: false
+blank_issues_enabled: true

.gitea/workflows/ci.yml

@@ -9,11 +9,9 @@ jobs:
   check-pr-title:
     name: Check PR Title
     runs-on: ubuntu-latest
-    if: github.event_name == 'pull_request'
-    env:
-      TITLE: ${{ gitea.event.pull_request.title }}
     steps:
       - run: |
+          TITLE="${{ gitea.event.pull_request.title }}"
           if ! echo "$TITLE" | grep -qE '^(WIP: )?(feat|fix|docs|chore|ci|test|refactor|perf|build|style|revert)(\(.+\))?(!)?: .+'; then
             echo "::error::Pull Request title must follow conventional commits"
             exit 1
@@ -32,8 +30,9 @@ jobs:
       - name: Check go mod tidy
         run: go mod tidy && git diff --exit-code go.mod go.sum
 
-      - name: Run linter
+      - uses: golangci/golangci-lint-action@v7
-        run: make lint-go
+        with:
+          version: latest
 
   lint-makefile:
     name: Makefile Lint
@@ -45,6 +44,9 @@ jobs:
         with:
           go-version-file: go.mod
 
+      - name: Install gremlins
+        run: go install github.com/checkmake/checkmake/cmd/checkmake@latest
+
       - name: Run mutation tests
         run: make lint-makefile
 
@@ -92,5 +94,8 @@ jobs:
         with:
           go-version-file: go.mod
 
+      - name: Install gremlins
+        run: go install github.com/go-gremlins/gremlins/cmd/gremlins@latest
+
       - name: Run mutation tests
         run: make test-mutation

.golangci.yml

@@ -114,9 +114,6 @@ linters:
     # Reports uses of functions with replacement inside the testing package.
     - usetesting
 
-    # Reports mixed receiver types in structs/interfaces.
-    - recvcheck
-
   settings:
     revive:
       rules:

Makefile

@@ -4,13 +4,17 @@ help: ## Show this help
 	@grep -E '^[a-zA-Z_-]+:.*##' $(MAKEFILE_LIST) | awk -F ':.*## ' '{printf "  %-15s %s\n", $$1, $$2}'
 
 install: ## Install dev tools
-	go mod download
+	go install github.com/golangci/golangci-lint/cmd/golangci-lint@latest
+	go install github.com/checkmake/checkmake/cmd/checkmake@latest
+	go install github.com/go-gremlins/gremlins/cmd/gremlins@latest
+	go install golang.org/x/tools/cmd/godoc@latest
+	go install golang.org/x/vuln/cmd/govulncheck@latest
 
 test-unit: ## Run unit tests with coverage
 	go test ./... -cover -v
 
 test-mutation: ## Run mutation tests with gremlins
-	go tool gremlins unleash
+	gremlins unleash
 
 FUZZ_TIME ?= 30
 
@@ -23,10 +27,10 @@ test-fuzz: ## Run all fuzz tests for 30s each
 test: test-unit test-mutation test-fuzz ## Run all tests
 
 lint-go: ## Lint Go code
-	go tool golangci-lint run ./...
+	golangci-lint run ./...
 
 lint-makefile: ## Lint the Makefile
-	go tool checkmake Makefile
+	checkmake Makefile
 
 lint-markdown: ## Lint Markdown files
 	docker run --rm -v $(CURDIR):/workdir davidanson/markdownlint-cli2 "**/*.md"
@@ -35,7 +39,7 @@ lint: lint-go lint-makefile lint-markdown ## Lint all code
 
 docs: ## Serve godoc locally
 	@echo ">>> Visit: http://localhost:6060/pkg/$$(go list -m)"
-	go tool godoc -http=:6060
+	godoc -http=:6060
 
 clean: ## Clean build and test caches
 	go clean -cache -testcache

bucket.go

@@ -0,0 +1,103 @@
+package cuckoo
+
+type entry[K, V any] struct {
+	key   K
+	value V
+}
+
+type slot[K, V any] struct {
+	entry[K, V]
+	occupied bool
+}
+
+type bucket[K, V any] struct {
+	hash           Hash[K]
+	slots          []slot[K, V]
+	capacity, size uint64
+	compare        EqualFunc[K]
+}
+
+// location determines where in the bucket a certain key would be placed. If the
+// capacity is 0, this will panic.
+func (b bucket[K, V]) location(key K) uint64 {
+	return b.hash(key) % b.capacity
+}
+
+func (b bucket[K, V]) get(key K) (value V, found bool) {
+	if b.capacity == 0 {
+		return
+	}
+
+	slot := b.slots[b.location(key)]
+	return slot.value, slot.occupied && b.compare(slot.key, key)
+}
+
+func (b *bucket[K, V]) drop(key K) (occupied bool) {
+	if b.capacity == 0 {
+		return
+	}
+
+	slot := &b.slots[b.location(key)]
+
+	if slot.occupied && b.compare(slot.key, key) {
+		slot.occupied = false
+		b.size--
+		return true
+	}
+
+	return false
+}
+
+func (b *bucket[K, V]) resize(capacity uint64) {
+	b.slots = make([]slot[K, V], capacity)
+	b.capacity = capacity
+	b.size = 0
+}
+
+func (b bucket[K, V]) update(key K, value V) (updated bool) {
+	if b.capacity == 0 {
+		return
+	}
+
+	slot := &b.slots[b.location(key)]
+
+	if slot.occupied && b.compare(slot.key, key) {
+		slot.value = value
+		return true
+	}
+
+	return false
+}
+
+func (b *bucket[K, V]) evict(insertion entry[K, V]) (evicted entry[K, V], eviction bool) {
+	if b.capacity == 0 {
+		return insertion, true
+	}
+
+	slot := &b.slots[b.location(insertion.key)]
+
+	if !slot.occupied {
+		slot.entry = insertion
+		slot.occupied = true
+		b.size++
+		return
+	}
+
+	if b.compare(slot.key, insertion.key) {
+		slot.value = insertion.value
+		return
+	}
+
+	insertion, slot.entry = slot.entry, insertion
+	return insertion, true
+}
+
+func newBucket[K, V any](capacity uint64, hash Hash[K], compare EqualFunc[K]) bucket[K, V] {
+	return bucket[K, V]{
+		hash:     hash,
+		capacity: capacity,
+		compare:  compare,
+		size:     0,
+		slots:    make([]slot[K, V], capacity),
+	}
+}

compare.go

@@ -2,7 +2,7 @@ package cuckoo
 
 // An EqualFunc determines whethers two keys are 'equal'. Keys that are 'equal'
 // are teated as the same by the [Table]. A good EqualFunc is pure,
-// deterministic, and fast. By default, [New] uses [DefaultEqualFunc].
+// deterministic, and fast. By default, [NewTable] uses [DefaultEqualFunc].
 //
 // This function MUST NOT return true if the [Hash] digest of two keys
 // are different: the [Table] will not work.

compare_example_test.go

@@ -28,7 +28,7 @@ func ExampleEqualFunc_badEqualFunc() {
 	// Two users with the same ID are equal.
 	isEqual := func(a, b User) bool { return a.ID == b.ID }
 
-	userbase := cuckoo.NewCustom[User, bool](makeHash(1), makeHash(2), isEqual)
+	userbase := cuckoo.NewCustomTable[User, bool](makeHash(1), makeHash(2), isEqual)
 
 	(userbase.Put(User{"1", "Robert Doe"}, true))
 

cuckoo_fuzz_test.go

@@ -3,6 +3,7 @@ package cuckoo_test
 import (
 	"fmt"
 	"maps"
+	"math"
 	"os"
 	"testing"
 
@@ -29,6 +30,7 @@ type fuzzStep struct {
 type fuzzScenario struct {
 	seedA, seedB           uint32
 	capacity, growthFactor uint8
+	load                   float64
 	steps                  []fuzzStep
 }
 
@@ -46,6 +48,7 @@ func FuzzInsertLookup(f *testing.F) {
 		seedA, seedB := scenario.seedA, scenario.seedB
 		growthFactor := max(2, int(scenario.growthFactor))
 		capacity := int(scenario.capacity)
+		minimumLoad := math.Abs(math.Mod(scenario.load, 1.0))
 
 		// If they are the same number, the hashes will clash, always causing an
 		// error.
@@ -53,37 +56,43 @@ func FuzzInsertLookup(f *testing.F) {
 			t.Skip()
 		}
 
-		fmt.Fprintf(os.Stderr, "seedA=%d seedB=%d capacity=%d growthFactor=%d\n",
+		// If the load is too high, the hashs will not be able to allocate
-			seedA, seedB, capacity, growthFactor)
+		// properly.
+		if minimumLoad > 0.20 {
+			t.Skip()
+		}
 
-		actual := cuckoo.NewCustom[uint32, uint32](
+		fmt.Fprintf(os.Stderr, "seedA=%d seedB=%d capacity=%d growthFactor=%d minimumLoad=%f\n",
+			seedA, seedB, capacity, growthFactor, minimumLoad)
+
+		actual := cuckoo.NewCustomTable[uint32, uint32](
 			offsetHash(seedA),
 			offsetHash(seedB),
 			func(a, b uint32) bool { return a == b },
 			cuckoo.Capacity(capacity),
 			cuckoo.GrowthFactor(growthFactor),
+			cuckoo.MinimumLoad(minimumLoad),
 		)
 
 		expected := map[uint32]uint32{}
 
 		for _, step := range scenario.steps {
 			if step.drop {
-				ok := actual.Drop(step.key)
+				err := actual.Drop(step.key)
-				_, has := expected[step.key]
+				assert.NoError(err)
-				assert.Equal(ok, has)
 
 				delete(expected, step.key)
 
-				_, ok = actual.Get(step.key)
+				_, err = actual.Get(step.key)
-				assert.False(ok)
+				assert.Error(err)
 			} else {
 				err := actual.Put(step.key, step.value)
 				assert.NoError(err)
 
 				expected[step.key] = step.value
 
-				found, ok := actual.Get(step.key)
+				found, err := actual.Get(step.key)
-				assert.True(ok)
+				assert.NoError(err)
 				assert.Equal(step.value, found)
 			}
 

cuckoo_internal_test.go

@@ -11,7 +11,7 @@ func TestMaxEvictions(t *testing.T) {
 	assert := assert.New(t)
 
 	for i := 16; i < 116; i++ {
-		table := New[int, bool](Capacity(i / 2))
+		table := NewTable[int, bool](Capacity(i / 2))
 		expectedEvictions := 3 * math.Floor(math.Log2(float64(i)))
 
 		assert.Equal(table.maxEvictions(), int(expectedEvictions))
@@ -20,7 +20,7 @@ func TestMaxEvictions(t *testing.T) {
 
 func TestLoad(t *testing.T) {
 	assert := assert.New(t)
-	table := New[int, bool](Capacity(8))
+	table := NewTable[int, bool](Capacity(8))
 
 	for i := range 16 {
 		err := table.Put(i, true)

cuckoo_test.go

@@ -14,7 +14,7 @@ import (
 func TestNewTable(t *testing.T) {
 	assert := assert.New(t)
 
-	table := cuckoo.New[int, bool]()
+	table := cuckoo.NewTable[int, bool]()
 
 	assert.NotNil(table)
 	assert.Zero(table.Size())
@@ -23,7 +23,7 @@ func TestNewTable(t *testing.T) {
 func TestAddItem(t *testing.T) {
 	assert := assert.New(t)
 	key, value := 0, true
-	table := cuckoo.New[int, bool]()
+	table := cuckoo.NewTable[int, bool]()
 
 	err := table.Put(key, value)
 
@@ -35,7 +35,7 @@ func TestAddItem(t *testing.T) {
 func TestPutOverwrite(t *testing.T) {
 	assert := assert.New(t)
 	key, value, newValue := 0, 1, 2
-	table := cuckoo.New[int, int]()
+	table := cuckoo.NewTable[int, int]()
 	(table.Put(key, value))
 
 	err := table.Put(key, newValue)
@@ -50,7 +50,7 @@ func TestPutOverwrite(t *testing.T) {
 func TestSameHash(t *testing.T) {
 	assert := assert.New(t)
 	hash := func(int) uint64 { return 0 }
-	table := cuckoo.NewCustom[int, bool](hash, hash, cuckoo.DefaultEqualFunc[int])
+	table := cuckoo.NewCustomTable[int, bool](hash, hash, cuckoo.DefaultEqualFunc[int])
 
 	errA := table.Put(0, true)
 	errB := table.Put(1, true)
@@ -63,14 +63,14 @@ func TestSameHash(t *testing.T) {
 
 func TestStartingCapacity(t *testing.T) {
 	assert := assert.New(t)
-	table := cuckoo.New[int, bool](cuckoo.Capacity(64))
+	table := cuckoo.NewTable[int, bool](cuckoo.Capacity(64))
 
 	assert.Equal(uint64(128), table.TotalCapacity())
 }
 
 func TestResizeCapacity(t *testing.T) {
 	assert := assert.New(t)
-	table := cuckoo.New[int, bool](
+	table := cuckoo.NewTable[int, bool](
 		cuckoo.Capacity(8),
 		cuckoo.GrowthFactor(2),
 	)
@@ -85,7 +85,7 @@ func TestResizeCapacity(t *testing.T) {
 
 func TestPutMany(t *testing.T) {
 	assert := assert.New(t)
-	expected, actual := map[int]bool{}, cuckoo.New[int, bool]()
+	expected, actual := map[int]bool{}, cuckoo.NewTable[int, bool]()
 
 	for i := range 1_000 {
 		expected[i] = true
@@ -100,7 +100,7 @@ func TestPutMany(t *testing.T) {
 
 func TestGetMany(t *testing.T) {
 	assert := assert.New(t)
-	table := cuckoo.New[int, bool]()
+	table := cuckoo.NewTable[int, bool]()
 
 	for i := range 1_000 {
 		err := table.Put(i, true)
@@ -108,12 +108,12 @@ func TestGetMany(t *testing.T) {
 	}
 
 	for i := range 2_000 {
-		value, ok := table.Get(i)
+		value, err := table.Get(i)
 		if i < 1_000 {
-			assert.True(ok)
+			assert.NoError(err)
 			assert.Equal(value, true)
 		} else {
-			assert.False(ok)
+			assert.Error(err)
 		}
 	}
 }
@@ -121,12 +121,12 @@ func TestGetMany(t *testing.T) {
 func TestDropExistingItem(t *testing.T) {
 	assert := assert.New(t)
 	key, value := 0, true
-	table := cuckoo.New[int, bool]()
+	table := cuckoo.NewTable[int, bool]()
 	(table.Put(key, value))
 
-	had := table.Drop(key)
+	err := table.Drop(key)
 
-	assert.True(had)
+	assert.NoError(err)
 	assert.Equal(0, table.Size())
 	assert.False(table.Has(key))
 }
@@ -134,11 +134,11 @@ func TestDropExistingItem(t *testing.T) {
 func TestDropNoItem(t *testing.T) {
 	assert := assert.New(t)
 	key := 0
-	table := cuckoo.New[int, bool]()
+	table := cuckoo.NewTable[int, bool]()
 
-	had := table.Drop(key)
+	err := table.Drop(key)
 
-	assert.False(had)
+	assert.NoError(err)
 	assert.Equal(0, table.Size())
 	assert.False(table.Has(key))
 }
@@ -146,15 +146,16 @@ func TestDropNoItem(t *testing.T) {
 func TestDropItemCapacity(t *testing.T) {
 	assert := assert.New(t)
 	key := 0
-	table := cuckoo.New[int, bool](
+	table := cuckoo.NewTable[int, bool](
 		cuckoo.Capacity(64),
 		cuckoo.GrowthFactor(2),
 	)
 
 	startingCapacity := table.TotalCapacity()
-	table.Drop(key)
+	err := table.Drop(key)
 	endingCapacity := table.TotalCapacity()
 
+	assert.NoError(err)
 	assert.Equal(0, table.Size())
 	assert.Equal(uint64(128), startingCapacity)
 	assert.Equal(uint64(64), endingCapacity)
@@ -163,7 +164,7 @@ func TestDropItemCapacity(t *testing.T) {
 func TestPutNoCapacity(t *testing.T) {
 	assert := assert.New(t)
 	key, value := 0, true
-	table := cuckoo.New[int, bool](
+	table := cuckoo.NewTable[int, bool](
 		cuckoo.Capacity(0),
 	)
 
@@ -176,7 +177,7 @@ func TestPutNoCapacity(t *testing.T) {
 
 func TestBadHashCapacity(t *testing.T) {
 	assert := assert.New(t)
-	table := cuckoo.NewCustom[int, bool](
+	table := cuckoo.NewCustomTable[int, bool](
 		func(int) uint64 { return 0 },
 		func(int) uint64 { return 0 },
 		func(a, b int) bool { return a == b },
@@ -196,15 +197,15 @@ func TestBadHashCapacity(t *testing.T) {
 
 func TestDropResizeCapacity(t *testing.T) {
 	assert := assert.New(t)
-	table := cuckoo.New[int, bool](
+	table := cuckoo.NewTable[int, bool](
 		cuckoo.Capacity(10),
 	)
 
 	err1 := table.Put(0, true)
 	err2 := table.Put(1, true)
-	table.Drop(1)
+	err3 := table.Drop(1)
 
-	assert.NoError(errors.Join(err1, err2))
+	assert.NoError(errors.Join(err1, err2, err3))
 	assert.Equal(uint64(20), table.TotalCapacity())
 }
 
@@ -216,7 +217,9 @@ func TestNewTableBy(t *testing.T) {
 	}
 
 	assert := assert.New(t)
-	table := cuckoo.NewBy[User, bool](func(u User) string { return u.id })
+	table := cuckoo.NewTableBy[User, bool](
+		func(u User) string { return u.id },
+	)
 
 	err := table.Put(User{nil, "1", "Robert"}, true)
 

doc.go

@@ -1,12 +1,9 @@
 // Package cuckoo provides a hash table that uses cuckoo hashing to achieve
 // a worst-case O(1) lookup time.
 //
-// While a [New] only supports comparable keys by default, you can create
+// While a [NewTable] only supports comparable keys by default, you can create
-// a table with any key type using [NewCustom]. Custom [Hash] functions and
+// a table with any key type using [NewCustomTable]. Custom [Hash] functions and
 // key comparison are also supported.
 //
-// NOTE: The [Table] is a look-up structure, and not a source of truth. If
-// [ErrBadHash] occurs, the data cannot be restored.
-//
 // See more: https://en.wikipedia.org/wiki/Cuckoo_hashing
 package cuckoo

doc_example_test.go

@@ -8,25 +8,25 @@ import (
 )
 
 func Example_basic() {
-	table := cuckoo.New[int, string]()
+	table := cuckoo.NewTable[int, string]()
 
 	if err := table.Put(1, "Hello, World!"); err != nil {
 		fmt.Println("Put error:", err)
 	}
 
-	if item, ok := table.Get(1); !ok {
+	if item, err := table.Get(1); err != nil {
-		fmt.Println("Not Found 1!")
+		fmt.Println("Error:", err)
 	} else {
 		fmt.Println("Found 1:", item)
 	}
 
-	if item, ok := table.Get(0); !ok {
+	if item, err := table.Get(0); err != nil {
-		fmt.Println("Not Found 0!")
+		fmt.Println("Error:", err)
 	} else {
 		fmt.Println("Found 0:", item)
 	}
 
 	// Output:
 	// Found 1: Hello, World!
-	// Not Found 0!
+	// Error: key '0' not found
 }

docs/adr/000_template.md

@@ -1,15 +0,0 @@
-# Title
-
-**Status**: <!-- Proposed, accepted, rejected, etc... -->
-
-## Context
-
-<!-- What is the issue that we're seeing that is motivating this decision or change? -->
-
-## Decision
-
-<!-- What is the change that we're proposing and/or doing? -->
-
-## Consequences
-
-<!-- What becomes easier or more difficult to do because of this change? -->

docs/adr/001_design_principles.md

@@ -1,44 +0,0 @@
-# Adopt Congruent and Familiar Design For `go-cuckoo`
-
-**Status**: Proposed
-
-## Context
-
-I built `go-cuckoo`'s API interface without design intent.
-Up until now, I paid more attention implementing the underlying functionality of the cuckoo hashing.
-With the fundamentals of the algorithm built, I should revisit the interface.
-
-The goal of this project was to create an implementation of cuckoo hashing, while adhering to Go's idioms, and being as usable as possible.
-While the implementation does work, it lacks direction.
-
-## Decision
-
-To resolve this, I'm enforcing two new principles onto the contract of `go-cuckoo`:
-
-- **Congruency**:
-  A `go-cuckoo` table should have the same core functionality as Go's built-in map.
-
-- **Familiarity**:
-  A `go-cuckoo` table should behave similarly to Go's standard map, so users will intuitively know how to use it.
-  In effect, its users will carry less cognitive load.
-
-These principles should _guide_ the public interface of `go-cuckoo`.
-Neither should be treated absolutely, though.
-The behavior of `go-cuckoo` is distinct from `map`.
-Do not equate them.
-
-## Consequences
-
-1. The repository should support both design principles.
-   - [ ] Update the `README.md` and `doc.go` to reflect these principles.
-   - [ ] Update the contributing guide and pull request template to require these principles are met.
-2. The repository should contain a living document, describing the interface differences between `go-cuckoo` and `map`.
-   I should prioritize limiting any incongruencies.
-   - [ ] Produce the first draft to uncover any current incongruencies.
-   - [ ] Link the document to the `README.md`.
-3. Analyze the familiarity of `go-cuckoo`'s current interface.
-   Unlike the analysis of congruency, this should be a one time document.
-   Familiarity is implicit to users, and does not need to be referenced.
-   But, any rationale should be documented in commit messages, or future ADRs.
-   - [ ] Produce the analysis document.
-   - [ ] Resolve any issues found.

go.mod

@@ -4,225 +4,7 @@ go 1.25.6
 
 require github.com/stretchr/testify v1.11.1
 
-require (
+require github.com/kr/pretty v0.3.1 // indirect
-	4d63.com/gocheckcompilerdirectives v1.3.0 // indirect
-	4d63.com/gochecknoglobals v0.2.2 // indirect
-	charm.land/lipgloss/v2 v2.0.3 // indirect
-	codeberg.org/chavacava/garif v0.2.0 // indirect
-	codeberg.org/polyfloyd/go-errorlint v1.9.0 // indirect
-	dev.gaijin.team/go/exhaustruct/v4 v4.0.0 // indirect
-	dev.gaijin.team/go/golib v0.6.0 // indirect
-	github.com/4meepo/tagalign v1.4.3 // indirect
-	github.com/Abirdcfly/dupword v0.1.7 // indirect
-	github.com/AdminBenni/iota-mixing v1.0.0 // indirect
-	github.com/AlwxSin/noinlineerr v1.0.5 // indirect
-	github.com/Antonboom/errname v1.1.1 // indirect
-	github.com/Antonboom/nilnil v1.1.1 // indirect
-	github.com/Antonboom/testifylint v1.6.4 // indirect
-	github.com/BurntSushi/toml v1.6.0 // indirect
-	github.com/ClickHouse/clickhouse-go-linter v1.2.0 // indirect
-	github.com/Djarvur/go-err113 v0.1.1 // indirect
-	github.com/MakeNowJust/heredoc v1.0.0 // indirect
-	github.com/Masterminds/semver/v3 v3.5.0 // indirect
-	github.com/MirrexOne/unqueryvet v1.5.4 // indirect
-	github.com/OpenPeeDeeP/depguard/v2 v2.2.1 // indirect
-	github.com/alecthomas/chroma/v2 v2.24.1 // indirect
-	github.com/alecthomas/go-check-sumtype v0.3.1 // indirect
-	github.com/alexkohler/nakedret/v2 v2.0.6 // indirect
-	github.com/alexkohler/prealloc v1.1.0 // indirect
-	github.com/alfatraining/structtag v1.0.0 // indirect
-	github.com/alingse/asasalint v0.0.11 // indirect
-	github.com/alingse/nilnesserr v0.2.0 // indirect
-	github.com/ashanbrown/forbidigo/v2 v2.3.1 // indirect
-	github.com/ashanbrown/makezero/v2 v2.2.1 // indirect
-	github.com/beorn7/perks v1.0.1 // indirect
-	github.com/bkielbasa/cyclop v1.2.3 // indirect
-	github.com/blizzy78/varnamelen v0.8.0 // indirect
-	github.com/bluekeyes/go-gitdiff v0.8.1 // indirect
-	github.com/bombsimon/wsl/v4 v4.7.0 // indirect
-	github.com/bombsimon/wsl/v5 v5.8.0 // indirect
-	github.com/breml/bidichk v0.3.3 // indirect
-	github.com/breml/errchkjson v0.4.1 // indirect
-	github.com/butuzov/ireturn v0.4.1 // indirect
-	github.com/butuzov/mirror v1.3.0 // indirect
-	github.com/catenacyber/perfsprint v0.10.1 // indirect
-	github.com/ccojocar/zxcvbn-go v1.0.4 // indirect
-	github.com/cespare/xxhash/v2 v2.3.0 // indirect
-	github.com/charithe/durationcheck v0.0.11 // indirect
-	github.com/charmbracelet/colorprofile v0.4.3 // indirect
-	github.com/charmbracelet/ultraviolet v0.0.0-20251205161215-1948445e3318 // indirect
-	github.com/charmbracelet/x/ansi v0.11.7 // indirect
-	github.com/charmbracelet/x/term v0.2.2 // indirect
-	github.com/charmbracelet/x/termios v0.1.1 // indirect
-	github.com/charmbracelet/x/windows v0.2.2 // indirect
-	github.com/checkmake/checkmake v0.3.2 // indirect
-	github.com/ckaznocha/intrange v0.3.1 // indirect
-	github.com/clipperhouse/displaywidth v0.11.0 // indirect
-	github.com/clipperhouse/uax29/v2 v2.7.0 // indirect
-	github.com/curioswitch/go-reassign v0.3.0 // indirect
-	github.com/daixiang0/gci v0.13.7 // indirect
-	github.com/dave/dst v0.27.3 // indirect
-	github.com/denis-tingaikin/go-header v0.5.0 // indirect
-	github.com/dlclark/regexp2 v1.12.0 // indirect
-	github.com/ettle/strcase v0.2.0 // indirect
-	github.com/fatih/color v1.19.0 // indirect
-	github.com/fatih/structtag v1.2.0 // indirect
-	github.com/firefart/nonamedreturns v1.0.6 // indirect
-	github.com/fsnotify/fsnotify v1.9.0 // indirect
-	github.com/fzipp/gocyclo v0.6.0 // indirect
-	github.com/ghostiam/protogetter v0.3.20 // indirect
-	github.com/go-critic/go-critic v0.14.3 // indirect
-	github.com/go-gremlins/gremlins v0.6.0 // indirect
-	github.com/go-ini/ini v1.67.0 // indirect
-	github.com/go-toolsmith/astcast v1.1.0 // indirect
-	github.com/go-toolsmith/astcopy v1.1.0 // indirect
-	github.com/go-toolsmith/astequal v1.2.0 // indirect
-	github.com/go-toolsmith/astfmt v1.1.0 // indirect
-	github.com/go-toolsmith/astp v1.1.0 // indirect
-	github.com/go-toolsmith/strparse v1.1.0 // indirect
-	github.com/go-toolsmith/typep v1.1.0 // indirect
-	github.com/go-viper/mapstructure/v2 v2.5.0 // indirect
-	github.com/go-xmlfmt/xmlfmt v1.1.3 // indirect
-	github.com/gobwas/glob v0.2.3 // indirect
-	github.com/godoc-lint/godoc-lint v0.11.2 // indirect
-	github.com/gofrs/flock v0.13.0 // indirect
-	github.com/golang/protobuf v1.5.3 // indirect
-	github.com/golangci/asciicheck v0.5.0 // indirect
-	github.com/golangci/dupl v0.0.0-20260401084720-c99c5cf5c202 // indirect
-	github.com/golangci/go-printf-func-name v0.1.1 // indirect
-	github.com/golangci/gofmt v0.0.0-20250106114630-d62b90e6713d // indirect
-	github.com/golangci/golangci-lint/v2 v2.12.2 // indirect
-	github.com/golangci/golines v0.15.0 // indirect
-	github.com/golangci/misspell v0.8.0 // indirect
-	github.com/golangci/plugin-module-register v0.1.2 // indirect
-	github.com/golangci/revgrep v0.8.0 // indirect
-	github.com/golangci/rowserrcheck v0.0.0-20260419091836-c5f79b8a11ba // indirect
-	github.com/golangci/swaggoswag v0.0.0-20250504205917-77f2aca3143e // indirect
-	github.com/golangci/unconvert v0.0.0-20250410112200-a129a6e6413e // indirect
-	github.com/google/go-cmp v0.7.0 // indirect
-	github.com/gordonklaus/ineffassign v0.2.0 // indirect
-	github.com/gostaticanalysis/analysisutil v0.7.1 // indirect
-	github.com/gostaticanalysis/comment v1.5.0 // indirect
-	github.com/gostaticanalysis/forcetypeassert v0.2.0 // indirect
-	github.com/gostaticanalysis/nilerr v0.1.2 // indirect
-	github.com/hako/durafmt v0.0.0-20210608085754-5c1018a4e16b // indirect
-	github.com/hashicorp/go-immutable-radix/v2 v2.1.0 // indirect
-	github.com/hashicorp/go-version v1.9.0 // indirect
-	github.com/hashicorp/golang-lru/v2 v2.0.7 // indirect
-	github.com/hexops/gotextdiff v1.0.3 // indirect
-	github.com/inconshreveable/mousetrap v1.1.0 // indirect
-	github.com/jgautheron/goconst v1.10.0 // indirect
-	github.com/jjti/go-spancheck v0.6.5 // indirect
-	github.com/julz/importas v0.2.0 // indirect
-	github.com/karamaru-alpha/copyloopvar v1.2.2 // indirect
-	github.com/kisielk/errcheck v1.10.0 // indirect
-	github.com/kkHAIKE/contextcheck v1.1.6 // indirect
-	github.com/kulti/thelper v0.7.1 // indirect
-	github.com/kunwardeep/paralleltest v1.0.15 // indirect
-	github.com/lasiar/canonicalheader v1.1.2 // indirect
-	github.com/ldez/exptostd v0.4.5 // indirect
-	github.com/ldez/gomoddirectives v0.8.0 // indirect
-	github.com/ldez/grignotin v0.10.1 // indirect
-	github.com/ldez/structtags v0.6.1 // indirect
-	github.com/ldez/tagliatelle v0.7.2 // indirect
-	github.com/ldez/usetesting v0.5.0 // indirect
-	github.com/leonklingele/grouper v1.1.2 // indirect
-	github.com/lucasb-eyer/go-colorful v1.4.0 // indirect
-	github.com/macabu/inamedparam v0.2.0 // indirect
-	github.com/manuelarte/embeddedstructfieldcheck v0.4.0 // indirect
-	github.com/manuelarte/funcorder v0.6.0 // indirect
-	github.com/maratori/testableexamples v1.0.1 // indirect
-	github.com/maratori/testpackage v1.1.2 // indirect
-	github.com/matoous/godox v1.1.0 // indirect
-	github.com/mattn/go-colorable v0.1.14 // indirect
-	github.com/mattn/go-isatty v0.0.20 // indirect
-	github.com/mattn/go-runewidth v0.0.23 // indirect
-	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
-	github.com/mgechev/revive v1.15.0 // indirect
-	github.com/mitchellh/go-homedir v1.1.0 // indirect
-	github.com/moricho/tparallel v0.3.2 // indirect
-	github.com/muesli/cancelreader v0.2.2 // indirect
-	github.com/nakabonne/nestif v0.3.1 // indirect
-	github.com/nishanths/exhaustive v0.12.0 // indirect
-	github.com/nishanths/predeclared v0.2.2 // indirect
-	github.com/nunnatsa/ginkgolinter v0.23.0 // indirect
-	github.com/olekukonko/cat v0.0.0-20250911104152-50322a0618f6 // indirect
-	github.com/olekukonko/errors v1.1.0 // indirect
-	github.com/olekukonko/ll v0.1.3 // indirect
-	github.com/olekukonko/tablewriter v1.1.2 // indirect
-	github.com/pelletier/go-toml/v2 v2.3.1 // indirect
-	github.com/prometheus/client_golang v1.12.1 // indirect
-	github.com/prometheus/client_model v0.2.0 // indirect
-	github.com/prometheus/common v0.32.1 // indirect
-	github.com/prometheus/procfs v0.7.3 // indirect
-	github.com/quasilyte/go-ruleguard v0.4.5 // indirect
-	github.com/quasilyte/go-ruleguard/dsl v0.3.23 // indirect
-	github.com/quasilyte/gogrep v0.5.0 // indirect
-	github.com/quasilyte/regex/syntax v0.0.0-20210819130434-b3f0c404a727 // indirect
-	github.com/quasilyte/stdinfo v0.0.0-20220114132959-f7386bf02567 // indirect
-	github.com/raeperd/recvcheck v0.2.0 // indirect
-	github.com/rivo/uniseg v0.4.7 // indirect
-	github.com/rogpeppe/go-internal v1.14.1 // indirect
-	github.com/ryancurrah/gomodguard v1.4.1 // indirect
-	github.com/ryancurrah/gomodguard/v2 v2.1.3 // indirect
-	github.com/ryanrolds/sqlclosecheck v0.6.0 // indirect
-	github.com/sagikazarmark/locafero v0.12.0 // indirect
-	github.com/sanposhiho/wastedassign/v2 v2.1.0 // indirect
-	github.com/santhosh-tekuri/jsonschema/v6 v6.0.2 // indirect
-	github.com/sashamelentyev/interfacebloat v1.1.0 // indirect
-	github.com/sashamelentyev/usestdlibvars v1.29.0 // indirect
-	github.com/securego/gosec/v2 v2.26.1 // indirect
-	github.com/sirupsen/logrus v1.9.4 // indirect
-	github.com/sivchari/containedctx v1.0.3 // indirect
-	github.com/sonatard/noctx v0.5.1 // indirect
-	github.com/sourcegraph/go-diff v0.8.0 // indirect
-	github.com/spf13/afero v1.15.0 // indirect
-	github.com/spf13/cast v1.10.0 // indirect
-	github.com/spf13/cobra v1.10.2 // indirect
-	github.com/spf13/pflag v1.0.10 // indirect
-	github.com/spf13/viper v1.21.0 // indirect
-	github.com/ssgreg/nlreturn/v2 v2.2.1 // indirect
-	github.com/stbenjam/no-sprintf-host-port v0.3.1 // indirect
-	github.com/stretchr/objx v0.5.2 // indirect
-	github.com/subosito/gotenv v1.6.0 // indirect
-	github.com/tetafro/godot v1.5.6 // indirect
-	github.com/timakin/bodyclose v0.0.0-20260129054331-73d1f95b84b4 // indirect
-	github.com/timonwong/loggercheck v0.11.0 // indirect
-	github.com/tomarrell/wrapcheck/v2 v2.12.0 // indirect
-	github.com/tommy-muehle/go-mnd/v2 v2.5.1 // indirect
-	github.com/ultraware/funlen v0.2.0 // indirect
-	github.com/ultraware/whitespace v0.2.0 // indirect
-	github.com/uudashr/gocognit v1.2.1 // indirect
-	github.com/uudashr/iface v1.4.2 // indirect
-	github.com/xen0n/gosmopolitan v1.3.0 // indirect
-	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
-	github.com/yagipy/maintidx v1.0.0 // indirect
-	github.com/yeya24/promlinter v0.3.0 // indirect
-	github.com/ykadowak/zerologlint v0.1.5 // indirect
-	github.com/yuin/goldmark v1.7.13 // indirect
-	gitlab.com/bosi/decorder v0.4.2 // indirect
-	go-simpler.org/musttag v0.14.0 // indirect
-	go-simpler.org/sloglint v0.12.0 // indirect
-	go.augendre.info/arangolint v0.4.0 // indirect
-	go.augendre.info/fatcontext v0.9.0 // indirect
-	go.uber.org/multierr v1.10.0 // indirect
-	go.uber.org/zap v1.27.0 // indirect
-	go.yaml.in/yaml/v3 v3.0.4 // indirect
-	golang.org/x/exp/typeparams v0.0.0-20260209203927-2842357ff358 // indirect
-	golang.org/x/mod v0.35.0 // indirect
-	golang.org/x/sync v0.20.0 // indirect
-	golang.org/x/sys v0.43.0 // indirect
-	golang.org/x/telemetry v0.0.0-20260421165255-392afab6f40e // indirect
-	golang.org/x/text v0.36.0 // indirect
-	golang.org/x/tools v0.44.0 // indirect
-	golang.org/x/tools/cmd/godoc v0.1.0-deprecated // indirect
-	golang.org/x/tools/godoc v0.1.0-deprecated // indirect
-	golang.org/x/vuln v1.3.0 // indirect
-	google.golang.org/protobuf v1.36.10 // indirect
-	honnef.co/go/tools v0.7.0 // indirect
-	mvdan.cc/gofumpt v0.9.2 // indirect
-	mvdan.cc/unparam v0.0.0-20251027182757-5beb8c8f8f15 // indirect
-)
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
@@ -230,11 +12,3 @@ require (
 	github.com/trailofbits/go-fuzz-utils v0.0.0-20260318143407-0907cafe7589
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
-
-tool (
-	github.com/checkmake/checkmake/cmd/checkmake
-	github.com/go-gremlins/gremlins/cmd/gremlins
-	github.com/golangci/golangci-lint/v2/cmd/golangci-lint
-	golang.org/x/tools/cmd/godoc
-	golang.org/x/vuln/cmd/govulncheck
-)

settings.go

@@ -9,20 +9,14 @@ import "fmt"
 const DefaultCapacity uint64 = 16
 
 // DefaultGrowthFactor is the standard resize multiplier for a [Table]. Most
-// implementations use 2.
+// hash table implementations use 2.
 const DefaultGrowthFactor uint64 = 2
 
-// defaultMinimumLoad is the default lowest acceptable occupancy of a [Table].
+// DefaultMinimumLoad is the default lowest acceptable occupancy of a [Table].
-// The higher the minimum load, the more likely that a [Table.Put] will not
+// The value of 5% is taken from [libcuckoo].
-// succeed. The value of 5% is taken from [libcuckoo].
 //
 // [libcuckoo]: https://github.com/efficient/libcuckoo/blob/656714705a055df2b7a605eb3c71586d9da1e119/libcuckoo/cuckoohash_config.hh#L21
-const defaultMinimumLoad float64 = 0.05
+const DefaultMinimumLoad float64 = 0.05
-
-// defaultGrowthLimit is the maximum number of times a [Table] can grow in a
-// single [Table.Put], before the library infers it will lead to a stack
-// overflow. The value of '64' was chosen arbirarily.
-const defaultGrowthLimit uint64 = 64
 
 type settings struct {
 	growthFactor  uint64
@@ -31,10 +25,10 @@ type settings struct {
 }
 
 // An Option modifies the settings of a [Table]. It is used in its constructors
-// like [New], for example.
+// like [NewTable], for example.
 type Option func(*settings)
 
-// Capacity modifies the starting capacity of each subtable of the [Table]. The
+// Capacity modifies the starting capacity of each bucket of the [Table]. The
 // value must be non-negative.
 func Capacity(value int) Option {
 	if value < 0 {
@@ -44,6 +38,19 @@ func Capacity(value int) Option {
 	return func(s *settings) { s.bucketSize = uint64(value) }
 }
 
+// MinimumLoad modifies the [DefaultMinimumLoad] of the [Table]. The value must
+// be between 0.00 and 1.00.
+//
+// The higher the minimum load, the more likely that a [Table.Put] will not
+// succeed. Minimum loads above 20% are not tested.
+func MinimumLoad(value float64) Option {
+	if value < 0.00 || value > 1.00 {
+		panic(fmt.Sprintf("go-cuckoo: MinimumLoad must be between 0.00 and 1.00, got %f", value))
+	}
+
+	return func(s *settings) { s.minLoadFactor = value }
+}
+
 // GrowthFactor controls how much the capacity of the [Table] multiplies when
 // it must resize. The value must be greater than 1.
 func GrowthFactor(value int) Option {

subtable.go

@@ -1,107 +0,0 @@
-package cuckoo
-
-// An entry is a key-value pair.
-type entry[K, V any] struct {
-	key   K
-	value V
-}
-
-type slot[K, V any] struct {
-	entry[K, V]
-	occupied bool
-}
-
-type subtable[K, V any] struct {
-	hash           Hash[K]
-	slots          []slot[K, V]
-	capacity, size uint64
-	compare        EqualFunc[K]
-}
-
-// location determines where in the subtable a certain key would be placed. If
-// the capacity is 0, this will panic.
-func (t *subtable[K, V]) location(key K) uint64 {
-	return t.hash(key) % t.capacity
-}
-
-func (t *subtable[K, V]) get(key K) (value V, found bool) {
-	if t.capacity == 0 {
-		return
-	}
-
-	slot := t.slots[t.location(key)]
-	return slot.value, slot.occupied && t.compare(slot.key, key)
-}
-
-func (t *subtable[K, V]) drop(key K) (occupied bool) {
-	if t.capacity == 0 {
-		return
-	}
-
-	slot := &t.slots[t.location(key)]
-
-	if slot.occupied && t.compare(slot.key, key) {
-		slot.occupied = false
-		t.size--
-		return true
-	}
-
-	return false
-}
-
-func (t *subtable[K, V]) resized(capacity uint64) *subtable[K, V] {
-	return &subtable[K, V]{
-		slots:    make([]slot[K, V], capacity),
-		capacity: capacity,
-		hash:     t.hash,
-		compare:  t.compare,
-	}
-}
-
-func (t *subtable[K, V]) update(key K, value V) (updated bool) {
-	if t.capacity == 0 {
-		return
-	}
-
-	slot := &t.slots[t.location(key)]
-
-	if slot.occupied && t.compare(slot.key, key) {
-		slot.value = value
-		return true
-	}
-
-	return false
-}
-
-func (t *subtable[K, V]) insert(insertion entry[K, V]) (evicted entry[K, V], eviction bool) {
-	if t.capacity == 0 {
-		return insertion, true
-	}
-
-	slot := &t.slots[t.location(insertion.key)]
-
-	if !slot.occupied {
-		slot.entry = insertion
-		slot.occupied = true
-		t.size++
-		return
-	}
-
-	if t.compare(slot.key, insertion.key) {
-		slot.value = insertion.value
-		return
-	}
-
-	insertion, slot.entry = slot.entry, insertion
-	return insertion, true
-}
-
-func newSubtable[K, V any](capacity uint64, hash Hash[K], compare EqualFunc[K]) *subtable[K, V] {
-	return &subtable[K, V]{
-		hash:     hash,
-		capacity: capacity,
-		compare:  compare,
-		size:     0,
-		slots:    make([]slot[K, V], capacity),
-	}
-}

table.go

@@ -1,50 +1,41 @@
 package cuckoo
 
 import (
-	"errors"
 	"fmt"
 	"iter"
 	"math/bits"
 	"strings"
 )
 
-// ErrBadHash occurs when the hashes given to a [Table] cause too many key
+// A Table is hash table that uses cuckoo hashing to resolve collision. Create
-// collisions. Discard the old table, rebuild it from your source data, and try:
+// one with [NewTable]. Or if you want more granularity, use [NewTableBy] or
-//
+// [NewCustomTable].
-//  1. Different hash seeds. Equal seeds produce equal hash functions, which
-//     always cycle.
-//  2. A different [Hash] algorithm.
-var ErrBadHash = errors.New("bad hash")
-
-// A Table which uses cuckoo hashing to resolve collision. Create
-// one with [New]. Or if you want more granularity, use [NewBy] or
-// [NewCustom].
 type Table[K, V any] struct {
-	tableA, tableB *subtable[K, V]
+	bucketA, bucketB bucket[K, V]
-	growthFactor   uint64
+	growthFactor     uint64
-	minLoadFactor  float64
+	minLoadFactor    float64
 }
 
 // TotalCapacity returns the number of slots allocated for the [Table]. To get the
 // number of slots filled, look at [Table.Size].
-func (t *Table[K, V]) TotalCapacity() uint64 {
+func (t Table[K, V]) TotalCapacity() uint64 {
-	return t.tableA.capacity + t.tableB.capacity
+	return t.bucketA.capacity + t.bucketB.capacity
 }
 
 // Size returns how many slots are filled in the [Table].
-func (t *Table[K, V]) Size() int {
+func (t Table[K, V]) Size() int {
-	return int(t.tableA.size + t.tableB.size)
+	return int(t.bucketA.size + t.bucketB.size)
 }
 
 func log2(n uint64) (m int) {
 	return max(0, bits.Len64(n)-1)
 }
 
-func (t *Table[K, V]) maxEvictions() int {
+func (t Table[K, V]) maxEvictions() int {
 	return 3 * log2(t.TotalCapacity())
 }
 
-func (t *Table[K, V]) load() float64 {
+func (t Table[K, V]) load() float64 {
 	// When there are no slots in the table, we still treat the load as 100%.
 	// Every slot in the table is full.
 	if t.TotalCapacity() == 0 {
@@ -54,153 +45,116 @@ func (t *Table[K, V]) load() float64 {
 	return float64(t.Size()) / float64(t.TotalCapacity())
 }
 
-// insert attempts to put/update an entry in the table, without modifying the
+// resize clears all buckets, changes the sizes of them to a specific capacity,
-// size of the table. Returns a displaced entry and 'homeless = true' if an
+// and fills them back up again. It is a helper function for [Table.grow] and
-// entry could not be placed after exhausting evictions.
+// [Table.shrink]; use them instead.
-func (t *Table[K, V]) insert(entry entry[K, V]) (displaced entry[K, V], homeless bool) {
+func (t *Table[K, V]) resize(capacity uint64) error {
-	if t.tableA.update(entry.key, entry.value) {
+	entries := make([]entry[K, V], 0, t.Size())
-		return
-	}
-
-	if t.tableB.update(entry.key, entry.value) {
-		return
-	}
-
-	for range t.maxEvictions() {
-		if entry, homeless = t.tableA.insert(entry); !homeless {
-			return
-		}
-
-		if entry, homeless = t.tableB.insert(entry); !homeless {
-			return
-		}
-	}
-
-	return entry, true
-}
-
-// resized creates an empty copy of the table, with a new capacity for each
-// bucket.
-func (t *Table[K, V]) resized(capacity uint64) *Table[K, V] {
-	return &Table[K, V]{
-		growthFactor:  t.growthFactor,
-		minLoadFactor: t.minLoadFactor,
-		tableA:        t.tableA.resized(capacity),
-		tableB:        t.tableB.resized(capacity),
-	}
-}
-
-// resize creates a new [Table.resized] with 'capacity', inserts all items into
-// the array, and replaces the current table. It is a helper function for
-// [Table.grow] and [Table.shrink]; use them instead.
-func (t *Table[K, V]) resize(capacity uint64) bool {
-	updated := t.resized(capacity)
-
 	for k, v := range t.Entries() {
-		if _, failed := updated.insert(entry[K, V]{k, v}); failed {
+		entries = append(entries, entry[K, V]{k, v})
-			return false
+	}
+
+	t.bucketA.resize(capacity)
+	t.bucketB.resize(capacity)
+
+	for _, entry := range entries {
+		if err := t.Put(entry.key, entry.value); err != nil {
+			return err
 		}
 	}
 
-	*t = *updated
+	return nil
-	return true
 }
 
-// grow increases the table's capacity by the growth factor. If the
+// grow increases the table's capacity by the [Table.growthFactor]. If the
 // capacity is 0, it increases it to 1.
-func (t *Table[K, V]) grow() bool {
+func (t *Table[K, V]) grow() error {
 	var newCapacity uint64
 
 	if t.TotalCapacity() == 0 {
 		newCapacity = 1
 	} else {
-		newCapacity = t.tableA.capacity * t.growthFactor
+		newCapacity = t.bucketA.capacity * t.growthFactor
 	}
 
 	return t.resize(newCapacity)
 }
 
-// shrink reduces the table's capacity by the growth factor. It may
+// shrink reduces the table's capacity by the [Table.growthFactor]. It may
 // reduce it down to 0.
-func (t *Table[K, V]) shrink() bool {
+func (t *Table[K, V]) shrink() error {
-	return t.resize(t.tableA.capacity / t.growthFactor)
+	return t.resize(t.bucketA.capacity / t.growthFactor)
 }
 
-// Get fetches the value for a key in the [Table]. Matches the comma-ok pattern
+// Get fetches the value for a key in the [Table]. Returns an error if no value
-// of a builtin map; see [Table.Find] for plain indexing.
+// is found.
-func (t *Table[K, V]) Get(key K) (value V, ok bool) {
+func (t Table[K, V]) Get(key K) (value V, err error) {
-	if item, ok := t.tableA.get(key); ok {
+	if item, ok := t.bucketA.get(key); ok {
-		return item, true
+		return item, nil
 	}
 
-	if item, ok := t.tableB.get(key); ok {
+	if item, ok := t.bucketB.get(key); ok {
-		return item, true
+		return item, nil
 	}
 
-	return
+	return value, fmt.Errorf("key '%v' not found", key)
-}
-
-// Find fetches the value of a key. Matches direct indexing of a builtin map;
-// see [Table.Get] for a comma-ok pattern.
-func (t *Table[K, V]) Find(key K) (value V) {
-	value, _ = t.Get(key)
-	return
 }
 
 // Has returns true if a key has a value in the table.
-func (t *Table[K, V]) Has(key K) (exists bool) {
+func (t Table[K, V]) Has(key K) (exists bool) {
-	_, exists = t.Get(key)
+	_, err := t.Get(key)
-	return
+	return err == nil
 }
 
-// Put sets the value for a key. If it cannot be set, an error is returned.
+// Put sets the value for a key. Returns error if its value cannot be set.
 func (t *Table[K, V]) Put(key K, value V) (err error) {
-	var (
+	if t.bucketA.update(key, value) {
-		entry    = entry[K, V]{key, value}
+		return nil
-		homeless bool
-	)
-
-	for range defaultGrowthLimit {
-		if entry, homeless = t.insert(entry); !homeless {
-			return
-		}
-
-		// Both this and the growth limit are necessary: this catches bad hashes
-		// early when the table is sparse, while the latter catches cases where
-		// growing never helps.
-		if t.load() < t.minLoadFactor {
-			return fmt.Errorf("hash functions produced a cycle at load %d/%d: %w", t.Size(), t.TotalCapacity(), ErrBadHash)
-		}
-
-		// It is theoretically possible to have a table with a larger capacity
-		// that is valid. But this chance is astronomically small, so we ignore
-		// it in this implementation.
-		if grew := t.grow(); !grew {
-			return fmt.Errorf("could not redistribute entries into larger table: %w", ErrBadHash)
-		}
 	}
 
-	return fmt.Errorf("could not place entry after %d resizes: %w", defaultGrowthLimit, ErrBadHash)
+	if t.bucketB.update(key, value) {
-}
+		return nil
+	}
 
-// Drop removes a value for a key in the table. Returns whether the key had
+	entry, eviction := entry[K, V]{key, value}, false
-// existed.
+	for range t.maxEvictions() {
-func (t *Table[K, V]) Drop(key K) bool {
+		if entry, eviction = t.bucketA.evict(entry); !eviction {
-	occupied := t.tableA.drop(key) || t.tableB.drop(key)
+			return nil
+		}
+
+		if entry, eviction = t.bucketB.evict(entry); !eviction {
+			return nil
+		}
+	}
 
 	if t.load() < t.minLoadFactor {
-		// The error is not handled here, because table-shrinking is an internal
+		return fmt.Errorf("bad hash: resize on load %d/%d = %f", t.Size(), t.TotalCapacity(), t.load())
-		// optimization.
-		t.shrink()
 	}
 
-	return occupied
+	if err := t.grow(); err != nil {
+		return err
+	}
+
+	return t.Put(entry.key, entry.value)
+}
+
+// Drop removes a value for a key in the table. Returns an error if its value
+// cannot be removed.
+func (t *Table[K, V]) Drop(key K) (err error) {
+	t.bucketA.drop(key)
+	t.bucketB.drop(key)
+
+	if t.load() < t.minLoadFactor {
+		return t.shrink()
+	}
+
+	return nil
 }
 
 // Entries returns an unordered sequence of all key-value pairs in the table.
-func (t *Table[K, V]) Entries() iter.Seq2[K, V] {
+func (t Table[K, V]) Entries() iter.Seq2[K, V] {
 	return func(yield func(K, V) bool) {
-		for _, slot := range t.tableA.slots {
+		for _, slot := range t.bucketA.slots {
 			if slot.occupied {
 				if !yield(slot.key, slot.value) {
 					return
@@ -208,7 +162,7 @@ func (t *Table[K, V]) Entries() iter.Seq2[K, V] {
 			}
 		}
 
-		for _, slot := range t.tableB.slots {
+		for _, slot := range t.bucketB.slots {
 			if slot.occupied {
 				if !yield(slot.key, slot.value) {
 					return
@@ -219,8 +173,8 @@ func (t *Table[K, V]) Entries() iter.Seq2[K, V] {
 }
 
 // String returns the entries of the table as a string in the format:
-// "table[k1:v1 k2:v2 ...]".
+// "table[k1:v1 h2:v2 ...]".
-func (t *Table[K, V]) String() string {
+func (t Table[K, V]) String() string {
 	var sb strings.Builder
 	sb.WriteString("table[")
 
@@ -238,13 +192,13 @@ func (t *Table[K, V]) String() string {
 	return sb.String()
 }
 
-// NewCustom creates a [Table] with custom [Hash] and [EqualFunc]
+// NewCustomTable creates a [Table] with custom [Hash] and [EqualFunc]
 // functions, along with any [Option] the user provides.
-func NewCustom[K, V any](hashA, hashB Hash[K], compare EqualFunc[K], options ...Option) *Table[K, V] {
+func NewCustomTable[K, V any](hashA, hashB Hash[K], compare EqualFunc[K], options ...Option) *Table[K, V] {
 	settings := &settings{
 		growthFactor:  DefaultGrowthFactor,
 		bucketSize:    DefaultCapacity,
-		minLoadFactor: defaultMinimumLoad,
+		minLoadFactor: DefaultMinimumLoad,
 	}
 
 	for _, option := range options {
@@ -254,8 +208,8 @@ func NewCustom[K, V any](hashA, hashB Hash[K], compare EqualFunc[K], options ...
 	return &Table[K, V]{
 		growthFactor:  settings.growthFactor,
 		minLoadFactor: settings.minLoadFactor,
-		tableA:        newSubtable[K, V](settings.bucketSize, hashA, compare),
+		bucketA:       newBucket[K, V](settings.bucketSize, hashA, compare),
-		tableB:        newSubtable[K, V](settings.bucketSize, hashB, compare),
+		bucketB:       newBucket[K, V](settings.bucketSize, hashB, compare),
 	}
 }
 
@@ -263,10 +217,10 @@ func pipe[X, Y, Z any](a func(X) Y, b func(Y) Z) func(X) Z {
 	return func(x X) Z { return b(a(x)) }
 }
 
-// NewBy creates a [Table] for any key type by using keyFunc to derive a
+// NewTableBy creates a [Table] for any key type by using keyFunc to derive a
 // comparable key. Two keys with the same derived key are treated as equal.
-func NewBy[K, V any, C comparable](keyFunc func(K) C, options ...Option) *Table[K, V] {
+func NewTableBy[K, V any, C comparable](keyFunc func(K) C, options ...Option) *Table[K, V] {
-	return NewCustom[K, V](
+	return NewCustomTable[K, V](
 		pipe(keyFunc, NewDefaultHash[C]()),
 		pipe(keyFunc, NewDefaultHash[C]()),
 		func(a, b K) bool { return keyFunc(a) == keyFunc(b) },
@@ -274,10 +228,10 @@ func NewBy[K, V any, C comparable](keyFunc func(K) C, options ...Option) *Table[
 	)
 }
 
-// New creates a [Table] using the default [Hash] and [EqualFunc]. Use
+// NewTable creates a [Table] using the default [Hash] and [EqualFunc]. Use
 // the [Option] functions to configure its behavior. Note that this constructor
 // is only provided for comparable keys. For arbitrary keys, consider
-// [NewBy] or [NewCustom].
+// [NewTableBy] or [NewCustomTable].
-func New[K comparable, V any](options ...Option) *Table[K, V] {
+func NewTable[K comparable, V any](options ...Option) *Table[K, V] {
-	return NewCustom[K, V](NewDefaultHash[K](), NewDefaultHash[K](), DefaultEqualFunc[K], options...)
+	return NewCustomTable[K, V](NewDefaultHash[K](), NewDefaultHash[K](), DefaultEqualFunc[K], options...)
 }

wip/INTERFACE_ANALYSIS.md

@@ -1,643 +0,0 @@
-# Designing an Idiomatic API Interface
-
-- [Designing an Idiomatic API Interface](#designing-an-idiomatic-api-interface)
-  - [Current State](#current-state)
-    - [Interface of the Built-in Map](#interface-of-the-built-in-map)
-    - [Interface of `go-cuckoo`](#interface-of-go-cuckoo)
-    - [Determining Congruency](#determining-congruency)
-    - [Determining Familiarity](#determining-familiarity)
-  - [Target State](#target-state)
-    - [Solving Congruency](#solving-congruency)
-
-We (the maintainers) built `go-cuckoo`'s API interface without design intent.
-Up until now, we paid more attention implementing the underlying functionality of the cuckoo hashing.
-
-With the fundamentals of the algorithm built, we should revisit the interface.
-It should align closer to the following principles:
-
-- **Congruency**
-  A `go-cuckoo` table should have the same core functionality as Go's built-in map.
-
-- **Familiarity**
-  A `go-cuckoo` table should behave similarly to Go's standard map, so users will intuitively know how to use it.
-  In effect, its users will carry less cognitive load.
-
-## Current State
-
-### Interface of the Built-in Map
-
-Listed below is every interface provided by Go to the built-in map object.
-Also included, are the functions from the package `maps` in the standard library.
-
-<details>
-<summary>Interfaces</summary>
-
-| #   | Built-in Interface                 | Description                                                                                                                                           |
-| --- | ---------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------- |
-| 1   | `m := make(map[K]V)`               | Returns an empty map using the built-in `make()` function.                                                                                            |
-| 2   | `m := make(map[K]V, hint)`         | Returns an empty map using `make()`, with a capacity 'hint'. This hint is how many items the map expects to hold, _not_ a measure of how large it is. |
-| 3   | `m := map[K]V{...}`                | Returns a map, which may be filled with entries in the ellipsis (optional).                                                                           |
-| 4   | `var m map[K]V`                    | Defines an empty _variable_ that holds a map. This differs from #1 because `m` is uninitialized (nil) here.                                           |
-| 5   | `m[k] := v`                        | Assigns the value of `k` to `v`.                                                                                                                      |
-| 6   | `v := m[k]`                        | Returns the value of `k` if it exists. Otherwise, `v` is uninitialized.                                                                               |
-| 7   | `v, ok := m[k]`                    | Similar to #6, except `ok` is equal to whether `v` is initialized. This is comma-ok notation.                                                         |
-| 8   | `for k, v := range m`              | Iterates over every key-value pair in `m`. The order is random.                                                                                       |
-| 9   | `delete(m, k)`                     | Unassigns the value `k`. Returns no value.                                                                                                            |
-| 10  | `clear(m)`                         | Unassigns all keys in `m`. Returns no value.                                                                                                          |
-| 11  | `n := len(m)`                      | Returns the number of entries in `m`. If nil, `m` returns 0.                                                                                          |
-| 12  | `m2 := maps.Clone(m)`              | Returns a copy of `m`.                                                                                                                                |
-| 13  | `maps.Copy(dst, src)`              | Assigns every entry of `src` in `dst`.                                                                                                                |
-| 14  | `ok := maps.Equal(m1, m2)`         | Returns true iff `m1` and `m2` the same entries.                                                                                                      |
-| 15  | `ok := maps.EqualFunc(m1, m2, fn)` | Like #14, but with a custom comparator for non-comparable values.                                                                                     |
-| 16  | `maps.DeleteFunc(m, fn)`           | Removes every entry in `m` which satisfies `fn`. Returns no value.                                                                                    |
-| 17  | `it2 := maps.All(m)`               | Returns an 2D iterator over every key-value pair.                                                                                                     |
-| 18  | `it := maps.Keys(m)`               | Returns an iterator over every key.                                                                                                                   |
-| 19  | `it := maps.Values(m)`             | Returns an iterator over every value. There can be duplicates.                                                                                        |
-| 20  | `m := maps.Collect(seq)`           | Returns a map, with every entry defined in a 2D iterator over key-value pairs.                                                                        |
-| 21  | `maps.Insert(m, seq)`              | Assigns to `m` all key-value pairs in 2D iterator `seq`. Returns no value.                                                                            |
-
-</details>
-
-### Interface of `go-cuckoo`
-
-On the other hand, here is the current contract for `go-cuckoo`.
-
-<details>
-<summary>Interfaces</summary>
-
-| #   | `go-cuckoo` Interface                              | Description                                                                                                                  |
-| --- | -------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------- |
-| 1   | `m := New(opts...)`                                | Creates a table using the default hash and equal function. The options configure its behavior. Confined to comparable keys.  |
-| 2   | `m := NewBy(keyFunc, opts...)`                     | Like #1, but allows any key type. A `keyFunc` is used to derive a comparable key.                                            |
-| 3   | `m := NewCustom(hashA, hashB, equalFunc, opts...)` | Like #1, but allows control over the hashes used to allow any key type. An `equalFunc` determines key equality.              |
-| 4   | `seq := m.Entries()`                               | Returns an unordered 2D iterator of all key-value pairs in the table.                                                        |
-| 5   | `v := m.Find(k)`                                   | Removes the value for `k`. Returns true if `k` existed.                                                                      |
-| 6   | `v, ok := m.Get(k)`                                | Returns the value for `k` in the table. Also, returns true if the `k` exists, otherwise false. When false, `v` is undefined. |
-| 7   | `ok := m.Has(k)`                                   | Returns true if `k` is in the table.                                                                                         |
-| 8   | `err := m.Put(k, v)`                               | Sets value `v` for key `k`. Otherwise, returns error.                                                                        |
-| 9   | `n := m.Size()`                                    | Returns the number of items in `m`.                                                                                          |
-| 10  | `str := m.String()`                                | Returns `m` as a string in the format "table[k1:v1 k2:v2 ...]".                                                              |
-| 11  | `cap := m.TotalCapacity()`                         | Returns how many slots `m` has allocated.                                                                                    |
-| 12  | `ok := m.Drop(k)`                                  | Removes `k` from the table. Returns whether the key had existed.                                                             |
-
-</details>
-
-### Determining Congruency
-
-So, how does the core functionality compare?
-Listed below is an analysis of every interface in Go's standard map.
-Each is compared against what `go-cuckoo` offers, and categorized into the following groups:
-
-- ✅ Covered: an analog exists.
-- ⚠️ Partial: workaround available.
-- ❌ Gap: no analog yet; addressed in [Target State](#solving-congruency).
-
-Specifically, here we are checking for functionality.
-Is there functionality that this offers which `go-cuckoo` does not?
-We are checking accessibility, but not discoverability.
-The latter will be considered later.
-
-<details>
-<summary>✅ <code>m := make(map[K]V)</code></summary>
-
-The analog is `m := New()`.
-
-</details>
-
-<details>
-<summary>⚠️ <code>m := make(map[K]V, hint)</code></summary>
-
-This has no simple analog.
-
-It is close to `m := New(Capacity(hint))`, but it assigns starting capacity, not expected size.
-For the built-in map, these are two separate things.
-
-- Capacity is an internal measure, used to optimize space/speed.
-  It is hidden from the user because it depends on the underlying implementation, which may change.
-- Expected size requires the map must hold a number of items before resizing.
-  This is tangeable and agnostic to implementation, hence why it is given to the user.
-
-In short, this interface defines expected size, but `Capacity()` defines capacity.
-
-</details>
-
-<details>
-<summary>❌ <code>m := map[K]V{...}</code></summary>
-
-This has no simple analog, the closest being:
-
-```go
-m := New[K, V]()
-for k, v := range startingEntries {
-  m.Put(k, v)
-}
-```
-
-It is idiomatic, but far less ergonomic.
-
-</details>
-
-<details>
-<summary>✅ <code>var m map[K]V</code></summary>
-
-The analog is `var m Table[K, V]`.
-
-</details>
-
-<details>
-<summary>✅ <code>m[k] := v</code></summary>
-
-The analog is `err := m.Put(k, v)`.
-
-</details>
-
-<details>
-<summary>✅ <code>v := m[k]</code></summary>
-
-The analog is `v := m.Find(k)`.
-
-</details>
-
-<details>
-<summary>✅ <code>v, ok := m[k]</code></summary>
-
-The analog is `v, ok := m.Get(k)`.
-
-</details>
-
-<details>
-<summary>✅ <code>for k, v := range m</code></summary>
-
-The analog is `for k, v := range m.Entries()`.
-
-</details>
-
-<details>
-<summary>✅ <code>delete(m, k)</code></summary>
-
-The analog is `ok := m.Drop(k)`.
-
-</details>
-
-<details>
-<summary>❌ <code>clear(m)</code></summary>
-
-There is no analog.
-
-The easiest may to do this is to delete all items individually:
-
-```go
-for k := range m.Entries() {
-  m.Drop(k)
-}
-```
-
-</details>
-
-<details>
-<summary>✅ <code>n := len(m)</code></summary>
-
-The analog is `n := m.Size()`.
-
-</details>
-
-<details>
-<summary>❌ <code>m2 := maps.Clone(m)</code></summary>
-
-There is no analog.
-
-The easiest way to do this currently is to make a new map, and manually add the items.
-
-```go
-m2 := cuckoo.Table[K, V]()
-
-for k, v := range m.Entries() {
-  m2.Put(k, v)
-}
-```
-
-This gets complicated by the various options available to the user.
-Furthermore, any custom `EqualFunc`, `keyFunc` or `Hash` is not transferred.
-
-</details>
-
-<details>
-<summary>❌ <code>maps.Copy(dst, src)</code></summary>
-
-There is no analog.
-
-The simplest way to do this is with a for-loop.
-
-```go
-for k, v := range src.Entries() {
-  dst.Put(k, v)
-}
-```
-
-</details>
-
-<details>
-<summary>❌ <code>ok := maps.Equal(m1, m2)</code></summary>
-
-There is no analog.
-
-Users have to manually check the key-value pairs to determine equality.
-
-</details>
-
-<details>
-<summary>❌ <code>ok := maps.EqualFunc(m1, m2, fn)</code></summary>
-
-There is no analog.
-
-Users have to manually check the key-value pairs to determine equality.
-
-</details>
-
-<details>
-<summary>❌ <code>maps.DeleteFunc(m, fn)</code></summary>
-
-There is no analog.
-
-Users have to manually delete keys.
-
-</details>
-
-<details>
-<summary>✅ <code>it2 := maps.All(m)</code></summary>
-
-The analog is `it2 := m.Entries()`.
-
-</details>
-
-<details>
-<summary>⚠️ <code>it := maps.Keys(m)</code></summary>
-
-There is no simple analog.
-
-A close neighbor is `it2 := m.Entries()`.
-Users can use this in a for-loop, and pick out just the keys:
-
-```go
-for k := range m.Entries() {
-  // ...
-}
-```
-
-</details>
-
-<details>
-<summary>⚠️ <code>it := maps.Values(m)</code></summary>
-
-There is no simple analog.
-
-A close neighbor is `it2 := m.Entries()`.
-Users can use this in a for-loop, and pick out just the values:
-
-```go
-for _, v := range m.Entries() {
-  // ...
-}
-```
-
-</details>
-
-<details>
-<summary>❌ <code>m := maps.Collect(seq)</code></summary>
-
-There is no analog.
-
-</details>
-
-<details>
-<summary>❌ <code>maps.Insert(m, seq)</code></summary>
-
-There is no analog.
-
-</details>
-
-### Determining Familiarity
-
-We can categorize all existing table functionality by each interface's familiarity:
-
-- ✅ Idiomatic: is clear, intuitive, and easily understood.
-- ❌ Non-idiomatic: is misleading; addressed in [Target State](#solving-congruency).
-
-<details>
-<summary>✅ <code>m := New(opts...)</code></summary>
-
-Criteria:
-
-Noun/adjective form — Go constructors use NewX where X is a noun or adjective, not a verb or past participle (NewReaderSize, not NewSized)
-Names what the user provides — the suffix should hint at the distinguishing parameter (NewBufferString tells you it takes a string)
-Progression is readable — the three names together should imply simple → intermediate → advanced
-Not misleadingly generic — NewWith or NewConfig could mean anything
-
-</details>
-
-<details>
-<summary><code>m := NewBy(keyFunc, opts...)</code></summary>
-
-- Use `NewKeyed()`.
-
-</details>
-
-<details>
-<summary><code>m := NewCustom(hashA, hashB, equalFunc, opts...)</code></summary>
-
-- Use `NewHashed()`.
-
-</details>
-
-<details>
-<summary>❌ <code>seq := m.Entries()</code></summary>
-
-- Call it `All()`.
-
-</details>
-
-<details>
-<summary><code>v := m.Find(k)</code></summary>
-
-- Call it `m.Lookup()`. The name `m.Find` implies a search algorithm.
-
-</details>
-
-<details>
-<summary><code>v, ok := m.Get(k)</code></summary>
-
-</details>
-
-<details>
-<summary><code>ok := m.Has(k)</code></summary>
-
-</details>
-
-<details>
-<summary>❌ <code>err := m.Put(k, v)</code></summary>
-
-- Call it `Set()`.
-- No built-in library consensus, but 3rd party packages prefer `Set()`.
-
-</details>
-
-<details>
-<summary>❌ <code>n := m.Size()</code></summary>
-
-- Call it `Len()`.
-- Size is a Java idiom.
-
-</details>
-
-<details>
-<summary>✅ <code>str := m.String()</code></summary>
-
-</details>
-
-<details>
-<summary>❌ <code>cap := m.TotalCapacity()</code></summary>
-
-- Remove. This is an implementation detail.
-
-</details>
-
-<details>
-<summary>❌ <code>ok := m.Drop(k)</code></summary>
-
-- Call it `Delete()`.
-
-</details>
-
-## Target State
-
-### Solving Congruency
-
-We should make the following changes to accomodate for congruency:
-
-<details>
-<summary><code>ok := maps.EqualFunc(m1, m2, fn)</code></summary>
-
-We should implement a new function:
-
-```go
-func EqualFunc[K, V1, V2 any](t1 *Table[K, V1], t2 *Table[K, V2], eq func(V1, V2) bool) bool
-```
-
-This function is free, and not bound as a receiver function.
-(It is called `cuckoo.Equal(t1, t2)`, not `t1.Equals(t2)`.)
-The latter implies `t1` has authority, when in fact neither do.
-
-We define equality as:
-
-1. Neither table has a key the other doesn't.
-2. Each key has the same value in each table.
-   Parameter `eq` determines this equality.
-
-Custom `EqualFunc`'s complicate this, as they modulate key identity in tables.
-If two tables may differ on whether two keys are different, this function might break.
-So, we must assume that:
-
-- Both tables have `EqualFunc`'s which 'agree' on the identity of the keys present in the tables.
-  Agreement is defined as: if two keys are distinct in one table, they are distinct in the other.
-
-The name `EqualFunc` is already taken by `EqualFunc[K, V]`: an alias for `func(a, b K) bool`.
-Inlining `EqualFunc[K, V]` would solve this problem.
-We will move the documentation attached to it to `DefaultEqualFunc`.
-
-</details>
-
-<details>
-<summary><code>ok := maps.Equal(m1, m2)</code></summary>
-
-We should implement a new function, to conform with the standard library:
-
-```go
-func Equal[K any, V comparable](t1, t2 *Table[K, V]) bool
-```
-
-It uses the same equality check as in `EqualFunc`.
-Once again, the function is free because it is symmetric.
-
-</details>
-
-<details>
-<summary><code>maps.Insert(m, seq)</code></summary>
-
-We should implement a new receiver for the table:
-
-```go
-func (t *Table[K, V]) Insert(seq iter.Seq2[K, V]) error
-```
-
-A receiver fits better even though `maps.Insert` is a free function, because copying it is asymmetric.
-Map `dst` receives entries from map `src`.
-It's only free because Go's standard map is built into the language, and so cannot have receivers.
-
-In terms of naming, `t.Extend` is more accurate, and has precedent in [Python](docs.python.org/3/tutorial/datastructures.html#more-on-lists) and [Rust](https://doc.rust-lang.org/std/iter/trait.Extend.html).
-When [adding iterator function](https://github.com/golang/go/issues/61900) to the `maps` package, the Go team chose to frame it as 'sources' and 'sinks'.
-With this model, `maps.Insert` made more sense than `maps.Extend`.
-Ultimately, `t.Insert()` is a better choice to be consistent with `maps`.
-
-</details>
-
-<details>
-<summary><code>maps.Copy(dst, src)</code></summary>
-
-We should implement a new receiver for the table:
-
-```go
-func (t *Table[K, V]) Copy(src *Table[K, V]) error
-```
-
-It's functionality should match that of `t.Insert()`.
-
-A receiver fits better even though `maps.Copy` is a free function, 'copying' it is asymmetric: `dst` is writen into by `src`.
-It is only free because Go's standard map is built into the language, and so cannot have receivers.
-
-The name `t.Merge()` might be more accurate, but it does work because:
-
-- `t.Copy()` matches Go's built-in `copy()`, and `io.Copy()`. The Go team used [the same logic](https://github.com/golang/go/discussions/47330#discussioncomment-1167799) to name `maps.Copy()`.
-  In this case, `t.Merge()` would be an outlier.
-- `t.Merge()` implies some sort of conflict-resolution, when there is not.
-  It simply overwrites the values.
-
-</details>
-
-<details>
-<summary><code>maps.DeleteFunc(m, fn)</code></summary>
-
-We should implement a new receiver for the table:
-
-```go
-func (t *Table[K, V]) DeleteFunc(del func(K, V) bool)
-```
-
-It would have the same functionality as `maps.DeleteFunc`.
-
-A free function could work here, but `t` has clear authority over `del`.
-Other than being consistent with the `maps` package, `t.DeleteFunc` follows the Go convention of appending `Func` to higher-order equivalents of functions.
-This trumps names like `t.DeleteIf`, which lend more to [Java](https://docs.oracle.com/javase/8/docs/api/java/util/ArrayList.html#removeIf-java.util.function.Predicate-) or [C++](https://en.cppreference.com/cpp/algorithm/remove).
-The word `Delete` is also convention, tying back to the built-in `delete()`.
-
-</details>
-
-<details>
-<summary><code>m := maps.Collect(seq)</code></summary>
-
-We should implement a new constructor.
-
-```go
-func Collect[K comparable, V any](seq iter.Seq2[K, V]) (*Table[K, V], error)
-```
-
-It would create a `New()` table, and insert all entries in `seq`.
-
-This reveicer only supports the standard table constructor, with comparable keys.
-It is tempting to add `CollectBy` or `CollectCustom` to support all table types, but doing so would pollute the public interface.
-
-It would be just one more line to initialize the table and then call `t.Insert` directly:
-
-```go
-t := // ...
-err := t.Insert(seq)
-```
-
-</details>
-
-<details>
-<summary><code>m := map[K]V{...}</code></summary>
-
-We should make a new constructor, because entries are generic.
-So, creating an option with inialized entries doesn't work.
-
-With the previous additions, users have a few options.
-If they want to use a `New()` table, `t.Collect` matches well:
-
-```go
-t, err := cuckoo.Collect(func(yield func(K, V) bool) {
-    yield(key1, val1)
-    yield(key2, val2)
-})
-```
-
-For `NewCustom()` or `NewBy()` tables, users can call `t.Insert` after initialization:
-
-```go
-t := // ...
-err := t.Insert(func(yield func(K, V) bool) {
-    yield(key1, val1)
-    yield(key2, val2)
-})
-```
-
-It is one more line.
-But, the alternative is polluting the public interface with corresponding `*WithEntries` constuctors.
-
-</details>
-
-<details>
-<summary><code>m := make(map[K]V, hint)</code></summary>
-
-We should add a new option:
-
-```go
-func ExpectedSize(n int) Option
-```
-
-When fed to a table, it will allocate enough space to hold `n` entries without a resize.
-
-</details>
-
-<details>
-<summary><code>clear(m)</code></summary>
-
-We should implement a new receiver:
-
-```go
-func (t *Table[K, V]) Clear()
-```
-
-It will remove all entries from the table.
-
-</details>
-
-<details>
-<summary><code>m2 := maps.Clone(m)</code></summary>
-
-We should implement a matching function:
-
-```go
-func (t *Table[K, V]) Clone() *Table[K, V]
-```
-
-Also, it will copy the hash, equality function, and options used in the table.
-
-</details>
-
-<details>
-<summary><code>it := maps.Keys(m)</code></summary>
-
-We should implement a matching function:
-
-```go
-func (t *Table[K, V]) Keys() iter.Seq[K]
-```
-
-It is tempting to just have `All()`, but it returns a `Seq2`, not a `Seq`.
-There is no iterator adaptor between `Seq` and `Seq2`, and will not be for the foreseeable future.
-This function, while it feels superfluous, is required.
-
-</details>
-
-<details>
-<summary><code>it := maps.Values(m)</code></summary>
-
-We should implement a matching function:
-
-```go
-func (t *Table[K, V]) Values() iter.Seq[V]
-```
-
-For the same reason we need `Keys()`, we also need `Values()`.
-
-</details>