[protonnegativo]

Decoding a Pkl Bytes value into an interface fails:

an internal error occurred: encountered unknown object code: 0x0f

decodeSlice handles codeBytes when the target is []byte, but decodePklObject (used for any targets) has no case for it. So a Bytes value fails to decode wherever the Go type is any. That includes a property typed Any, elements of a Listing<Any>, the members of a Dynamic, and EvaluateExpression into var out any.

To reproduce with real Pkl output, decode the committed test_fixtures/msgpack/collections.pkl.msgpack (res14: Bytes = Bytes(1, 2, 3, 4, 255)) into any with no registered schema:

b, _ := os.ReadFile("test_fixtures/msgpack/collections.pkl.msgpack")
v, err := newDecoder(b, map[string]reflect.Type{}).Decode(reflect.TypeFor[any]())
// before: err = encountered unknown object code: 0x0f
// after:  v.Interface().(Object).Properties["res14"] == []byte{0x1, 0x2, 0x3, 0x4, 0xff}

This change decodes it to []byte, the same type used for typed Bytes properties.

Testing: added a TestDecoder_Decode case ("should successfully decode interface with Pkl Bytes"). It fails on main and passes with the fix. go vet ./pkl/ is clean. In go test ./pkl/, the only failures are the tests that run the pkl CLI, which I don't have installed locally, and the same tests fail on main.

Note: when the decoded value is any, a Bytes used as a Set element or Map key still can't be decoded, because []byte is not a valid Go map key. With this change that case panics in reflect.SetMapIndex instead of returning the error above. This is the same as what already happens on main for Set { List() } into any, so I left it out of scope.

[HT154]

Thanks for the fix!