Fix containment check relying on ability to check for equality #1278
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Fixes #1277
Undefined,Uninitialized,Noneare sentinel values we should not observe. They are skipped in on_trait_change using identity check as well. This avoids errors like the one in #1277.Checklist
Update API reference (docs/source/traits_api_reference)Update User manual (docs/source/traits_user_manual)Update type annotation hints intraits-stubs