_magMul10AddChecked

private fn

void _magMul10AddChecked(int  PrecisionDigits)(
       ref  ubyte[16]  mag,  int  digit)

@safe pure

Multiplies a magnitude by 10, adds one digit and enforces the decimal precision (the byte-carry checks in _magMul10Add alone only detect overflow of the 16-byte array, not of a narrower digit precision).