Write value over 4 signed bytes, following 1 metadata byte

Property definitions

msgpack :: write $ Writer :: write_msgpack_int32
	# Write `value` over 4 signed bytes, following 1 metadata byte
	fun write_msgpack_int32(value: Int)
	do
		write_byte 0xD2
		write_bytes value.to_bytes(n_bytes=4)
	end
lib/msgpack/write.nit:119,2--124,4