Add a method to unwrap shim classes #10
Merged
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I didn't really want to go beyond the standard
pytz
protocol, but I realized that in order for someone to usehelpers.upgrade_tzinfo
, they would need a direct (not just a transitive) dependency onpytz_deprecation_shim
, whereas a method on the shim will work even if the library you are calling has stopped returning shims (assuming you call it only if the method is present).