ideal            2653 src/decNumber/decNumber.c   Int  ideal;                      // ideal (preferred) exponent
ideal            2704 src/decNumber/decNumber.c     ideal=(rhs->exponent&~1)/2;         // target
ideal            2709 src/decNumber/decNumber.c       res->exponent=ideal;              // use the ideal [safe]
ideal            2915 src/decNumber/decNumber.c           Int todrop=ideal-a->exponent;      // most that can be dropped