Noting that some other library might call `gc.enable()` is correct. But, then ignoring the fact that another library can simply call `gc.set_threshold(n > 0)` s

Noting that some other library might call `gc.enable()` is correct. But, then ignoring the fact that another library can simply call `gc.set_threshold(n > 0)` seems like an obvious bug in the waiting, and the same issue as something calling `gc.enable()`