INT_BITS_STRLEN_BOUND  108 lib/ftoastr.h     (INT_BITS_STRLEN_BOUND ((dig) * _GL_FLOAT_DIG_BITS_BOUND) + 1)
INT_BITS_STRLEN_BOUND   67 lib/intprops.h   (INT_BITS_STRLEN_BOUND (TYPE_WIDTH (t) - _GL_SIGNED_TYPE_OR_EXPR (t)) \