This is an arbitrary-precision library extracted from GNU bc 1.08.2, which is
available at https://www.gnu.org/software/bc/.

This code is subject to GNU GPL. See COPYING.

My config.h disables output and debugging code in number.c that is not used
in lbc. Here are the differences:

% diff bc-1.08.2/lib/number.c ./number.c
45a46
> #if 0
52a54
> #endif
1372a1375
> #if 0
1528a1532
> #endif
