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ec5c9ebe6e
Implemented the ``.get_history()`` method, which also implies availability of :attr:`.AttributeState.history`, for :func:`.synonym` attributes. Previously, trying to access attribute history via a synonym would raise an ``AttributeError``. Fixes: #3777 Change-Id: I20810a8b1a1bf630dbcb6622193c13cf4236b94a