hitting the max possible allocation size when U8 encoding with the custom gc

[radkomih]

Since U8 is used extensively, e.g. Sequence[U8], invoking value.Bytes() to return the bytes causes a significant performance overhead with the custom gc, and it tries to allocate single allocation bigger than the max possible.

func (value U8) Encode(buffer *bytes.Buffer) {
	encoder := Encoder{Writer: buffer}
	encoder.Write(value.Bytes())
}

func (value U8) Bytes() []byte {
	return []byte{byte(value)}
}

Instead encode the bytes directly

encoder.EncodeByte(byte(value))