Question for Parisse about CAS floating point

[parisse]

Inside Xcas (and the Prime CAS), a floating point value is always meant as an approximate representation of a real. This explains for example that gcd(1.25,0.25) returns 1 while gcd(5/4,1/4) returns 1/4, despite the fact that 5/4 and 1/4 are represented exactly with floating point numbers.