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Introduce a QuestionInterface trait that the base Question and all its
subclasses (ChoiceQuestion, ConfirmationQuestion, StrictConfirmationQuestion)
implement, with as_choice/as_confirmation downcasts standing in for PHP's
instanceof. Consumers (QuestionHelper, SymfonyQuestionHelper, SymfonyStyle,
ConsoleIO) now take a QuestionInterface boundary generically.
This fixes the instanceof emulation, which previously went through
as_any().downcast_ref on a concrete &Question and always returned None, and
unblocks the select/confirm/choice paths that were left as todo!() because a
polymorphic ChoiceQuestion/ConfirmationQuestion could not be passed to ask.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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