Dear list,

I was showing off Pharo to a colleague today and was surprised that.

My quick introduction of adding new methods on existing system classes

String>>firstLetter
^self copyFrom: 1 to: 1

- extension on String worked immediately. But that:

in the MethodFinder evaluating: 'tried'.'t'

did not return my method I just added .... :-(

Turns out that MethodFinder has a class side Set of Approved and AddAndRemove methods.

What is the rationale of this? Should we not allow any method, but exclude some tricky ones (doesNotUnderstand:, ... )?

Kind Regards,

Bart