Way to know if the rate limit is unlimited

[vzamanillo]

Could be useful having a method to now when the rate limit is unlimited or not.

[tarunKoyalwar]

@vzamanillo , can you share any use case perhaps ??

[vzamanillo]

Maybe I am missing something but I think you can't currently know what was the raw input value for the rate limit nor when it is unlimited, would be useful to know that for checking when a rate limit is set / not set / overwritten.

Checking subfinder

after those lines of code the input raw value is lost.

Considering the Limiter is an object who mostly does his work based on an input integer value at least would expose a method to recover that value and (plus) to know when it was not set (unlimited).

Also I would change the way on how it is initialized, it's pretty weird having to check the input value to create a new instance of the limiter using New or NewUnlimited, there should be a single initialize entry point with the necessary logic to know what to do and make the initialization abstract.