I recently sumbled at following behaviour:
sage: P.<x> = PolynomialRing(QQ)
sage: w = x + 1
sage: w(oo)
+ Infinity
sage: v = 5
sage: v(oo)
A positive finite number

This behaviour is strange (altough works as desined). For nonconstant 
polynomial it has the same effect as calculating limit, for constant 
polynomial it gives (seemingly) non-sensical result. Could the default 
behaviour be changed so in case of constant polynomial instead of coercing 
operands it would return simply the value of the polynomial (5 in this 
example)?

Regards,
MG

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