https://issues.dlang.org/show_bug.cgi?id=17340
--- Comment #1 from thomas.bock...@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. --