Well, you can. It's more work but you could make this first new version behave like the old version, with aformentioned warnings, but also support the fixed API when they use it with use Module qw(:always-die);
or use Module qw(:newapi);
or whatever. Then your next version can switch to new api and silently ignore that flag.
You can lead your users to water, but alas, you cannot drown them.
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