urlEncode() should only copy if necessary

[schuetzm]

No description provided.

[s-ludwig]

Could allOf make use of a sorted input array of characters and use a binary search (i.e. using assumeSorted)? Otherwise I'd use a switch range statement or an AA instead for efficiency reasons. Also for efficiency, using str.representation.allOf is preferred to avoid unnecessary UTF decoding.

[schuetzm]

I changed it to a switch statement. Both DMD and LDC compile it into a lookup table.

[s-ludwig]

Thanks, that should work.