This is a good case for macros in Python, actually. Fraction('0.1') is usually what you want, so Fraction(0.1) should mean just that and if you do want the curr

This is a good case for macros in Python, actually. Fraction('0.1') is usually what you want, so Fraction(0.1) should mean just that and if you do want the current behaviour, Fraction(float(0.1)) would do it. Same for Fraction(17/3) for example.