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fix: restrict missing component attributes to declared I/O fields - #301
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toby-coleman
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Oct 24, 2026
| raises `AttributeError` with the component and field names, and `hasattr` returns | ||
| `False`. Assigning `None` explicitly stores it as the field's value; an unset field | ||
| has no entry in the instance dictionary. | ||
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Reading an unknown public component attribute currently returns None, so misspelled fields also appear to exist through hasattr. Restrict that fallback to declared public inputs and outputs on the instance's current IOController. Unknown attributes now raise AttributeError with the component class, instance name, and field name.
Declared-but-unset ports continue returning None without assigning a value or making inputs ready. Explicitly assigning None retains an instance attribute. Runtime declarations from FileReader and FileWriter follow the same rules as static and inherited ports. Document this contract and add regression coverage for attribute lookup, dynamic instance isolation, initialization, export/reconstruction, and deepcopy.
Preserve the helpful ValidationError for components that omit super().init(). The missing name is now detected when the component ID is accessed during process construction, rather than later during process initialization.