A regression was introduced in this commit: https://github.com/dlang/phobos/commit/a07517abae8dce9e0687913b1a03c942aed60dce std.traits.isNumeric!bool should be false.
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.
I submitted a fix: https://github.com/dlang/phobos/pull/5343
Commits pushed to stable at https://github.com/dlang/phobos https://github.com/dlang/phobos/commit/83f757c17737cca5faeecdc77cae350f0bad9a4e Fix issue 17340 - isNumeric!bool should not be true https://github.com/dlang/phobos/commit/ef025a64ab1115281a033f6e8ad56421a23bd12b Merge pull request #5343 from tsbockman/is_bool_numeric Fix issue 17340 - isNumeric!bool should not be true
Commits pushed to master at https://github.com/dlang/phobos https://github.com/dlang/phobos/commit/83f757c17737cca5faeecdc77cae350f0bad9a4e Fix issue 17340 - isNumeric!bool should not be true https://github.com/dlang/phobos/commit/ef025a64ab1115281a033f6e8ad56421a23bd12b Merge pull request #5343 from tsbockman/is_bool_numeric
Commits pushed to dmd-cxx at https://github.com/dlang/phobos https://github.com/dlang/phobos/commit/83f757c17737cca5faeecdc77cae350f0bad9a4e Fix issue 17340 - isNumeric!bool should not be true https://github.com/dlang/phobos/commit/ef025a64ab1115281a033f6e8ad56421a23bd12b Merge pull request #5343 from tsbockman/is_bool_numeric