[Issue 6447] iota(BigInt) too

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=6447

--- Comment #8 from hsteoh at quickfur.ath.cx ---
Yes, but if BigInt(10) should work, then BigInt(2)^^65536 should work too. I
don't think you'd like it if the library imposed some arbitrary subrange on
your numeric types that may be used with iota (what if iota(10) worked but
iota(11) didn't?).

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