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f8999b63ae
This fix is long coming. For a long time due to the addition of a global user cache, the on_member_update event would only have the updated user in the very first dispatch due to a quirk in the reference only being updated once. In order to fix this issue two things had to change: 1. There had to be a new event, `on_user_update` to complement the equivalent member event. 2. Unnecessary copies of User had to be removed to compensate for the performance hit from the diffing. While doing these two fixes I also re-evaluated some more unnecessary copies done during the PRESENCE_UPDATE to add member case while fetch_offline_members=False is set or due to chunking issues. The number of copies was brought down from 2 to 1, discounting the original Member creation. Unsure on the benefits of this one, however. N.B: this doesn't change the pre-existing behaviour of on_member_update