[Issue 20950] std.conv.text(int) shouldn't needlessly allocate

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20950

--- Comment #3 from Steven Schveighoffer <schveiguy at yahoo.com> ---
That is the current case. I agree it shouldn't needlessly allocate if it can
help it. But then the "fix" needs to be defined as to how much allocation is
needed.

Int is straightforward -- the code is already in std.conv that can convert an
int to text without allocation. The general case is not as straightforward.

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