[Issue 8851] std.string.join should allow 'char' as joiner

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=8851

--- Comment #19 from bearophile_hugs at eml.cc ---
(In reply to Robert Schadek from comment #18)
> issue 5542 refers to the same bug

Issue 5542:
join("123", "x") ==> "1x2x3"

This issue:
join(["foo", "bar"], '|') ==> "foo|bar"

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