def _basilisp_bytecode(
    mtime: int, source_size: int, code: List[types.CodeType]
) -> bytes:
    """Return the bytes for a Basilisp bytecode cache file."""
    data = bytearray(MAGIC_NUMBER)
    data.extend(_w_long(mtime))
    data.extend(_w_long(source_size))
    data.extend(marshal.dumps(code))  # type: ignore
    return data
Return the bytes for a Basilisp bytecode cache file.