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Fix type: [A, B] + values: [...] raising IncompatibleOptionValues at definition time (#2814)

Sibling of #2812: parse_coerce stores a VariantCollectionCoercer in
@coerce_type for a multiple-type declaration, and the values coherence
check received the wrapper instead of the declared list — Object#===
matches nothing, so any type: [A, B] + values:/except_values: param
raised at definition time (accepted in 3.2.1). Feed the check the
declared member types; the wrapper stays in place for runtime coercion
and documentation.

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

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