primitive val HashByteSeq is
  HashFunction[(String box | Array[U8 val] box)] val,
  HashFunction64[(String box | Array[U8 val] box)] val

new val create()
: HashByteSeq val^

fun box hash(
  x: (String box | Array[U8 val] box))
: USize val

fun box hash64(
  x: (String box | Array[U8 val] box))
: U64 val

fun box eq(
  x: (String box | Array[U8 val] box),
  y: (String box | Array[U8 val] box))
: Bool val

fun box ne(
  that: HashByteSeq val)
: Bool val