> This example does not demonstrate the problem I am trying to solve. The
> problem is when behaviour changes, not when stuff gets removed.

SemVer still handles this case.

> Suppose rails has a #lol method. Currently #lol return "lol". We want to
> make it return "omg". How do we know whether a user is relying on the
> current return value of "lol", in order to give them a deprecation warning?

This is not backwards compatible. Therefore, a major version should be
increased when it changes.

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