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That won't be necessary. The change from == to <= is innocuous.
There's no need to lock-up maxsize in a read-only property. We're consenting adults. Besides, it would probably break someone-else's odd use case. I don't want to expand the API, nor do I want to cripple anyone's ability to do weird stuff with it.
FWIW, the full() and empty() methods are usually not a good idea. It's better to catch a Full exception. Otherwise, the information can be out of date by the time you try to use it.
I'm going to mark this as a 3.2 only change. There were no guarantees about the behavior when maxsize is changed, nor should we make such guarantees.