punycode: use strict identity operator

[JungMinu]

There is no type-conversion to be done because both parameters are already the same type.
Therefore, the === operator should be used for better performance.

[JungMinu]

Please refer to the following review
https://dorey.github.io/JavaScript-Equality-Table/

[mathiasbynens]

I seriously doubt == vs. === is ever going to be a performance bottleneck. Do you have a benchmark that demonstrates the improved performance you mentioned?

[JungMinu]

@mathiasbynens Do you prefer == to === in general?

[mathiasbynens]

@JungMinu Yeah, in all my code I’ve only been using === when I explicitly need strict equality.

[JungMinu]

@mathiasbynens Don't you think that there are some side-effects when using == in general?

https://dorey.github.io/JavaScript-Equality-Table/

Can I ask you please tell me why you prefer ==?

[mathiasbynens]

@JungMinu I agree, but in my own code I know which types to expect, so none of those side effects apply here.

[JungMinu]

@mathiasbynens Well, is there any benefit when using == rather than === whenever possible?
I'm not arguing, but I just want to know the reason :)

[sindresorhus]

Using === does make the code clearer and more consistent though.

[mathiasbynens]

No longer applicable.