I agree with Esteban here, I think we just have to agree to disagree :)
To me as well, is: #Number reads 100x worse than isNumber.

On Jun 25, 2013, at 12:33 PM, Igor Stasenko wrote:

In general, the more methods we put into Object, the higher
probability of name clashing (two projects using same selector
for method in Object but for different purpose).
It also slows down the lookup time, because VM checks every method
dictionary, including Object.
(not speaking of slowing down UI ;)

Really? I thought this was one of the things PIC's are good at for where it matters, only recording cases for objects actually sent the message from a call site.
(Not that that's a big consolation for isMorph and other abuses of inheritance/polymorphism, but still...)

Cheers,
Henry