chore: better maphash test

common/maphash/comparable_go120.go

@@ -138,3 +138,5 @@ func escape[T any](x T) T {
 // ptrSize is the size of a pointer in bytes - unsafe.Sizeof(uintptr(0)) but as an ideal constant.
 // It is also the size of the machine's native word size (that is, 4 on 32-bit systems, 8 on 64-bit).
 const ptrSize = 4 << (^uintptr(0) >> 63)
+
+const testComparableAllocations = false

common/maphash/comparable_go124.go

@@ -11,3 +11,5 @@ func Comparable[T comparable](seed Seed, v T) uint64 {
 func WriteComparable[T comparable](h *Hash, x T) {
 	maphash.WriteComparable(h, x)
 }
+
+const testComparableAllocations = true

common/maphash/maphash_test.go

@@ -423,7 +423,9 @@ func TestWriteComparableNoncommute(t *testing.T) {
 }
 
 func TestComparableAllocations(t *testing.T) {
-	t.Skip("test broken in old golang version")
+	if !testComparableAllocations {
+		t.Skip("test broken in old golang version")
+	}
 	seed := MakeSeed()
 	x := heapStr(t)
 	allocs := testing.AllocsPerRun(10, func() {