[Issue 13371] std.math.factorial

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13371

--- Comment #6 from bearophile_hugs at eml.cc ---
(In reply to safety0ff.bugz from comment #5)

> I think that any BigInt functions worth providing in phobos should be
> implemented within BigInt.

OK.

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