Which decimal? Fixed point, or floating point? Should the numerator and denominator be given the same bit width? How do you deal with overflow and underflow? I

Which decimal? Fixed point, or floating point? Should the numerator and denominator be given the same bit width? How do you deal with overflow and underflow? Its easy to think of "decimal" as one thing because every language provides a library called `decimal`, but there are a million subtle decisions and tradeoffs to make when choosing one standard binary representation. Most languages don't have a binary representation at all, and implement `decimal` as a high level abstraction with regular integers.