propose: Add First() on slice, empty to return nil

[justfunxin]

No description provided.

[freeeverett]

When the null value is not nil, I think the function cannot be implemented. Is there any way to implement the function?

[Alireza-Kiani]

Hey there, just created a pull request similar to what you need #451.
Returning zero value instead of nil is just more compatible with the conventions

[shivamrazorpay]

@kangarooxin as the issue is fixed, i think you can close it.