Wild (and I guess most of the time bad) idea: on top of the warnings, introduce a `sleep` in the deprecated functions. At every version, increase the sleep.
Has this ever been considered?
The problem with warnings is that they're not really observable: few people actually read these logs, most of the time. Making the deprecation observable means annoying the library users. The question is then: what's the smallest annoyance we can come up with, so that they still have a look?
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