Write the header for an application-specific extension of one data byte

After writing the header, clients should write the data byte.

Property definitions

msgpack :: write $ Writer :: write_msgpack_fixext1
	# Write the header for an application-specific extension of one data byte
	#
	# After writing the header, clients should write the data byte.
	fun write_msgpack_fixext1(typ: Int)
	do
		write_byte 0xD4
		write_byte typ
	end
lib/msgpack/write.nit:448,2--455,4