[Webkit-unassigned] [Bug 162932] New: Update DataTransfer.prototype.types to a frozen array that updates on changes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=162932

            Bug ID: 162932
           Summary: Update DataTransfer.prototype.types to a frozen array
                    that updates on changes
    Classification: Unclassified
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML Editing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: d at domenic.me

In https://github.com/whatwg/html/issues/11#issuecomment-249155408 we discussed aligning all browsers on a new model for DataTransfer.prototype.types. It has the following changes from WebKit's model:

- Return a FrozenArray, instead of an array
- Keep returning the same object until changes are made, instead of returning a new object each time. (This helps make dataTransfer.types === dataTransfer.types, which is false in Chrome currently.)

The spec pull request is up at https://github.com/whatwg/html/pull/1860, with web platform tests (unfortunately manual) available at https://github.com/w3c/web-platform-tests/pull/3871

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