class Async::HTTP::Body::Writable

def write(chunk)

Write a single chunk to the body. Signal completion by calling `#finish`. 
def write(chunk)
	# If the reader breaks, the writer will break.
	# The inverse of this is less obvious (*)
	if @closed
		raise(@error || Closed)
	end
	
	@count += 1
	@queue.enqueue(chunk)
end