What we've been discussing with Guille is that sometimes the 'type checking' (or actually, the conversion) is done, and sometimes not.
For example:
5 + true
true does not understand 'adaptToNumber:andSend:', so no magic conversion is done, but strings understand that message so we get things like:
5 + 'foo' = 5
This should be consistent regardless the type of the parameter.
Cheers,
Carla
Do we reeeeeally want to do
5 + '4'
5 + 'hello'
?