[Issue 9702] std.string.replace for single chars too?

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=9702

--- Comment #2 from Seb <greensunny12 at gmail.com> ---
1) replace comes from std.array

2) This would be fixed by https://github.com/dlang/phobos/pull/6022

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