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util.jwt: Provide built-in token expiry support (defaults to 3600s lifetime) To avoid every user of the library needing to add and verify expiry info, this is now handled by util.jwt itself (if not overridden or disabled). Issuing tokens that are valid forever is bad practice and rarely desired, and the default token lifetime is now 3600s (1 hour).

local record util_timer
	record task end
	type timer_callback = function (number) : number
	add_task : function ( number, timer_callback, any ) : task
	stop : function ( task )
	reschedule : function ( task, number ) : task
end
return util_timer