Yes, we did. I think it was the URI module. It changed how it translated some things in the uri_escape method.
This is one of my bigger fears. Module authors can change behavior, or even just change a default setting. If we have code that relied on this default, it might break. Actually, I think DBI changed a default in a somewhat recent update and I've got it on my list as something that might break.
The safe thing here is to check for the know changes before the update, but I don't relish going through the change notes for every module we have installed to see if they changed a key behavior or setting. But if we want to know what we're getting into, this may be necessary.
I have a script to report what code is using what module. For modules that only have one user, I guess I could get that developer to look into things. My problem there is that too often I was 'that developer' who recommended using a module. :)
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