Breaking Change 56015: dart:js_interop's ExternalDartReference will no longer implement Object

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Srujan Gaddam

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Jun 14, 2024, 5:45:43 PM6/14/24

`ExternalDartReference` will no longer implement `Object` as it will now have a nullable representation type.

`ExternalDartReference` allows users to pass opaque references to Dart values through JavaScript. In order to avoid extra null-checks and downcasts, this type will now represent a generic Dart value that is a subtype of `Object?`, and therefore can't implement `Object`.

See https://github.com/dart-lang/sdk/issues/56015 for more details. If this breaking change poses a severe problem, please leave a comment on the issue.

Srujan Gaddam

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Jun 27, 2024, 8:24:05 PM6/27/24

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This change has been implemented in https://github.com/dart-lang/sdk/commit/b8402f5c27200b29330f18d24bbd0545ad90712c.

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