content() inconsistencies

Hello, this symbol x("x"), a("a"); cout << (a*x/2+a*a/3).content(x) << endl; cout << (x/2+ex(1)/3).content(x) << endl; cout << (10*x/2+ex(15)/3).content(x) << endl; gives a 1 5 while Pari says 1/6*a 1/6 5 but I'm of the opinion it should be 1/6*a 1/6 5/6 I would fix it in ginac but what's the official definition of content? Regards, ralf