The conversion is accurate up to 15 digits. Round-tripping through floats should not cause artifacts if you know what you are doing and remain within that 15 di

The conversion is accurate up to 15 digits. Round-tripping through floats should not cause artifacts if you know what you are doing and remain within that 15 digit bound all time, and I believe that same applies for all basic arithmetic operations. So the question is, what are actually the cases where floats introduce "artifacts"