# Write `data` in _bin32_ format, max of 0xFFFF_FFFF bytes
	#
	# Require: `data.length <= 0xFFFF_FFFF`
	fun write_msgpack_bin32(data: Bytes)
	do
		var len = data.length
		assert len <= 0xFFFF_FFFF

		write_byte 0xC6
		write_bytes len.to_bytes(n_bytes=4)
		write_bytes data
	end