[Issue 19727] std.algorithm.endsWith fails to compile while startsWith succeeds

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19727

--- Comment #3 from Seb <greeenify at gmail.com> ---
(In reply to Simen Kjaeraas from comment #2)
> This boils down to [""].joiner("") not returning a bidirectional range.

For reference, here's the previous PR which added bidirectional range support
for joiner (without args)

https://github.com/dlang/phobos/pull/6115

Might be a good starting point for future work.

--