Reducing the cost of autodecoding

[safety0ff via Digitalmars-d]

On Thursday, 13 October 2016 at 14:51:50 UTC, Kagamin wrote:
> On Wednesday, 12 October 2016 at 20:24:54 UTC, safety0ff wrote:
>> Code: http://pastebin.com/CFCpUftW
>
> Line 25 doesn't look trusted: reads past the end of an empty 
> string.

Length is checked in the loop that calls this function.

In phobos length is only checked with an assertion,