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Technically, the previous code allowed extending the class to provide alternative implem via inheritance. Was it on purpose? Can't say right now, but that should be considered before approval.
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As of 3.0 getTimezones is a private static.. so not open for inheritance :)
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ok, strange, but verified: https://3v4l.org/n61o4
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Ah like so.. you're right i didnt checked it.. i assumed it :)
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OH, but you can turn it protected, so still open for extension!
https://3v4l.org/f2STp
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Right. I cant imagine this is done on purpose.. at least core doesnt seem to rely on it elsewhere.
Nice catch btw :)