fix: prevent users from settings a growthfactor=1

- This always causes errors, it should not be possible.

cuckoo_fuzz_test.go

@@ -50,7 +50,7 @@ func FuzzInsertLookup(f *testing.F) {
 		}
 
 		seedA, seedB := scenario.seedA, scenario.seedB
-		growthFactor := max(1, int(scenario.growthFactor))
+		growthFactor := max(2, int(scenario.growthFactor))
 		capacity := int(scenario.capacity)
 		minimumLoad := math.Abs(math.Mod(scenario.load, 1.0))
 

settings.go

@@ -49,10 +49,10 @@ func MinimumLoad(value float64) Option {
 }
 
 // GrowthFactor controls how much the capacity of the [Table] multiplies when
-// it must resize. The value must be greater than 0.
+// it must resize. The value must be greater than 1.
 func GrowthFactor(value int) Option {
-	if value <= 0 {
-		panic(fmt.Sprintf("go-cuckoo: GrowthFactor must be greater than 0, got %d", value))
+	if value < 2 {
+		panic(fmt.Sprintf("go-cuckoo: GrowthFactor must be greater than 1, got %d", value))
 	}
 
 	return func(s *settings) { s.growthFactor = uint64(value) }

testdata/fuzz/FuzzInsertLookup/a79aad05d13023ec

@@ -0,0 +1,2 @@
+go test fuzz v1
+[]byte("1000010X17000A11\xf5XA000\xe00001aA120000000000000111220000122910000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000")