Require that captured variables are marked with vm:shared #4282
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Amend shared native memory multithreading proposal to require that all captured variables are marked with
vm:sharedto make the closure shareable. This makes it clearer which values are crossing the boundary between isolates - which is significant for mutable values likeTypedData. It is complete parallel tovm:sharedannotations on static fields.(This makes tear-offs not shareable - at least for now).