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Implemented by every member of the InputPollMedia union — directly (the canonical abstract parent class declares implements InputPollMediaInterface) or via the additional-union-membership channel for multi-parent members (e.g. an InputMediaPhoto belongs to three unions but PHP can only extends one; the other two memberships are declared with implements <X>Interface). Use this type when typing a property or parameter that must admit every member of the union, including those whose PHP extends chain points elsewhere.