Darn right it should return False.  Given the principle of least surprise (and my prejudices built up over 40 years as a computer programmer) I would expect that decimal.Decimal data would be stored internally as some form of decimal data, and would store into a database as such.  It would be expected to be in a fixed point format.  Real, on the other hand, I would expect to be stored as an IEEE double precision floating point number, or something like that.