[r4venrudy]

Deserializing AdvancedCommerceSubscriptionModifyDescriptors with effective: "IMMEDIATELY" or "NEXT_BILL_CYCLE" leaves effective as None, even though rawEffective contains a recognized value. The same happens when constructing the model with rawEffective, and an enum-valued model no longer compares equal after a serialization round trip.

Inherit AttrsRawValueAware, as the sibling period-change model does, so initialization synchronizes the enum and raw fields. Add coverage for both known values, round trips, unknown values, and later assignments.

Validation on Windows / Python 3.12: the fixture assertion and four regression subtests fail before the fix. Afterward, the full suite passes: 225 tests and 4 subtests (python -m pytest tests -q). git diff --check passes.

[alexanderjordanbaker]

Resolved via #218

[r4venrudy]

you used my fix on your commit?