Re: master 87e422f: Beef up the Emacs string utility set a bit

[Mattias Engdegård]

Thanks for the good work! I suggest that 'string-limit' be replaced with two 
separate functions, 'string-prefix' and 'string-suffix', because these are two 
different operations and it makes no sense to multiplex them onto a single 
function with an argument saying which one we are going to use.

Suggested patch attached. The names can be discussed; for example, 
'string-left' and 'string-right' would do just as well.

If someone prefers saturating semantics for negative length arguments, then 
that's an option too. Ie, in case we want

 (string-prefix "abc" -2)

to yield the empty string instead of an error. I think an error is more useful.

The new functions are now inline (defsubst) in keeping with the spirit of 
subr-x.el. (We really should inline these better!)

0001-Replace-string-limit-with-string-prefix-and-string-s.patch
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