ideal            2637 src/decNumber/decNumber.c   Int  ideal;                      // ideal (preferred) exponent
ideal            2688 src/decNumber/decNumber.c     ideal=(rhs->exponent&~1)/2;         // target
ideal            2693 src/decNumber/decNumber.c       res->exponent=ideal;              // use the ideal [safe]
ideal            2899 src/decNumber/decNumber.c           Int todrop=ideal-a->exponent;      // most that can be dropped