[Issue 17340] isNumeric!bool should not be true

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=17340

--- Comment #1 from thomas.bockman at gmail.com ---
The new (wrong) behaviour was also retroactively added to the documentation in
a later commit:
https://github.com/dlang/phobos/commit/118f2d773317d0da76c0d9054e7bcddd2e83f887

However, prior to DMD 2.074 isNumeric did not work this way. It's a (presumably
accidental) breaking change.

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