I've thought about that approach too. But then asked myself whether it is more likely that there is code that relies on this bug than code where this went unnoticed and is therefore broken. What do the other think about that matter and the fix in Squeak?

Kasper Osterbye schrieb am Donnerstag, 28. April 2022 19:03:07 (+02:00):

Kasper Osterbye schrieb am Dienstag, 26. April 2022 14:50:51 (+02:00):

I have now raised it as an issue on the issue tracker

Issue #11165 in https://github.com/pharo-project/pharo/issues/11165

If I may suggest a solution it will be to:
add two new methods - prefixedBy: and suffixedBy: to handle the empty prefix/suffix correctly
add comments to beginsWith: and endsWith: referring to the two new methods

The problem is that there is client code which depend on the (wrong) implementation of the beginsWith and endsWith methods.