class Protocol::HTTP2::Window

def expand(amount)
	available = @available + amount
	
	if available > MAXIMUM_ALLOWED_WINDOW_SIZE
		raise FlowControlError, "Expanding window by #{amount} caused overflow: #{available} > #{MAXIMUM_ALLOWED_WINDOW_SIZE}!"
	end
	
	# puts "expand(#{amount}) @available=#{@available}"
	@available += amount
	@used -= amount
end