Today's bug is minor `libconfig` test suite failure: https://github.com/hyperrealm/libconfig/pull/260
There on 32-bit systems (and only on 32-bit ones) the config pretty-printer started prepending 32 leading zeros to binary integers:
bin_int = 0b000000000000000000000000000000001111;
instead of intended
bin_int = 0b1111;
Try to guess what the bug nature is before looking at the patch. I guessed wrong.