# is_polynomial with symbolic coefficients: bug ?

sage: s, a, b= var('s a b')

sage: (1/s^2 + s).is_polynomial(s)

False

sage: (a/s^2 + b*s).is_polynomial(s)

True

Should the second call of is_polynomial not return False as in the first case ?

Is this a bug ?

Who and howto report ?