# Returns argument `arg_name` as an Int or `null` if not found or not an integer.
	#
	# NOTE: Prioritizes POST before GET
	fun int_arg(arg_name: String): nullable Int do
		if not all_args.has_key(arg_name) then return null
		var i = all_args[arg_name]
		if not i.is_int then return null
		return i.to_i
	end