With this change the Dart Core Object members (`.hashCode`,
`.runtimeType`, `.noSuchMethod()`, `.toString()`, and
`operator ==`) are no longer installed onto the native JavaScript
Object prototype. This is done because the Object prototype will be
sealed as a security precaution in some environments to avoid
prototype pollution exploits.
This means that dispatching to these APIs will change when the
compiler cannot know if the receiver may be null or a value from
JavaScript interop. In those cases a call to a helper method is
inserted instead. The helpers will probe for the API on the value,
call it if available or execute a default version.
NOTE: Many other native JavaScript prototypes are still modified. This
change is only for the Object prototype.
Issue: https://github.com/dart-lang/sdk/issues/49670
Change-Id: Iddb3a48e790dd414aa3254d729535c4408e99b3d
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/310971
Reviewed-by: Srujan Gaddam <srujzs@google.com>
Commit-Queue: Nicholas Shahan <nshahan@google.com>
Reviewed-by: Sigmund Cherem <sigmund@google.com>
Nicholas Shahan
3c75002cee