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This code isn't going to win any beauty awards. I'd like to clean this up structurally before v3.0.0 final if I have time, but it's not going to involve any major API changes (just internal refactoring).
I figure it's okay to take out the invariant on
history.getCurrentLocation
because anybody attempting to use a v2 history will just hit an exception whenhistory.getCurrentLocation
fails due to not existing. If it comes up, it'd be easy enough to add back the inverse of the removed invariant to assert a non-v3 history.