[Issue 19982] padLeft usability issues

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19982

--- Comment #2 from Stephen Grammer <sgrammer at economicmodeling.com> ---
Thanks! I missed leftJustify. That is exactly what I need. If you are planning
to add more asserts to document the behavior of padLeft, maybe consider adding:
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// implicitly converts to a range of uint when padding dchar[] with char
static assert(is(ElementType!(typeof("string".padLeft('0', 10))) == uint));
static assert(is(ElementType!(typeof("string".padLeft(dchar('0'), 10))) ==
dchar));

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