Serializing UUIDs as strs and deserializing them as strs can lead to
somewhat obscure bugs such as the one that led to the creation of this
PR in django-cacheback
codeinthehole/django-cacheback#100 which some
would call unexpected behaviour.

After all, an UUID is altogether a different type from strs and if
bytes got their own serializer/deserializer for UUID the same logic
should apply.

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