Fix __contains__ and __eq__ override signatures

[bizfsc]

Fix __contains__ and __eq__ override signatures to satisfy the Liskov substitution principle.

Problem

mypy reports [override] errors because __contains__ and __eq__ methods use specific types (Union[int, str], ODRecord, etc.) instead of object as required by the Mapping, Container, and object supertypes.

Changes

canopen/objectdictionary/__init__.py

• ObjectDictionary.__contains__: accept object instead of Union[int, str]
• ODRecord.__contains__: accept object instead of Union[int, str]
• ODRecord.__eq__: accept object, return NotImplemented for non-ODRecord
• ODArray.__eq__: accept object, return NotImplemented for non-ODArray
• ODVariable.__eq__: accept object, return NotImplemented for non-ODVariable

canopen/sdo/base.py

• SdoBase.__contains__: accept object instead of Union[int, str]
• SdoRecord.__contains__: accept object instead of Union[int, str]
• SdoArray.__contains__: accept object instead of int, add isinstance guard

Impact

Eliminates all 18 [override] mypy errors (95 → 77 remaining).

[codecov]

Codecov Report

❌ Patch coverage is 93.75000% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
canopen/sdo/base.py	80.00%	0 Missing and 1 partial ⚠️

📢 Thoughts on this report? Let us know!