Sam Saffron bd5fa1737d FIX: add_to_serializer not correctly accounting for inheritance chains
This is a very long standing bug we had, if a plugin attempted to amend a
serializer core was not "correcting" the situation for all descendant classes
this often only showed up in production cause production eager loads serializers
prior to plugins amending them.

This is a critical fix for various plugins
2019-08-27 18:21:53 +10:00
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