distincts are much faster than ranges

tests/tarrays2.nim

@@ -0,0 +1,17 @@
+import drchaos/mutator, std/random
+
+const
+  MaxFaces = 6
+
+type
+  DiceFace = distinct int #range[1..6]
+
+proc `==`(a, b: DiceFace): bool {.borrow.}
+
+proc mutate(value: var DiceFace; sizeIncreaseHint: int; enforceChanges: bool; r: var Rand) =
+  repeatMutate(DiceFace(mutateEnum(value.int, MaxFaces, r)+1))
+
+func fuzzTarget(x: array[10, DiceFace]) =
+  doAssert x != array[10, DiceFace]([1, 6, 2, 3, 4, 3, 6, 4, 5, 2])
+
+defaultMutator(fuzzTarget)