[Issue 16078] %e (scientific notation) should be supported for all BigInt

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=16078

--- Comment #1 from Berni44 <bugzilla at bernis-buecher.de> ---
I split this into BigInt / built-ins - see issue 21847.

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