People: I'll post a reviewed version of the PEP. The only differences with the previous one will be the treatmen to float in both explicit and implicit construction: ------------ In Explicit construction: You can not call Decimal with a float. Instead you must use a method: Decimal.fromFloat(). The syntax: Decimal.fromFloat(floatNumber, positions) where floatNumber is the float number origin of the construction and positions is the positions after the decimal point where you apply a round-half-up rounding. In this way you can do, for example: Decimal.fromFloat(1.1, 2): The same that doing Decimal('1.1'). Decimal.fromFloat(1.1, 16): The same that doing Decimal('1.1000000000000001'). Decimal.fromFloat(1.1): The same that doing Decimal('110000000000000008881784197001252...e-51'). In Implicit construction: Raise TypeError. You can not mix Decimal and float. ------------ If you're ok, I'll post this. Thank you! . Facundo