[Webkit-unassigned] [Bug 186191] New: Consider MasqueradesAsUndefinedObjectType

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=186191

            Bug ID: 186191
           Summary: Consider MasqueradesAsUndefinedObjectType
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: utatane.tea at gmail.com

MasqueradesAsUndefined is crazy feature,

1. It is introduced for backward compatibility of `if (document.all)` thingy. It is unlikely that MasqueradesAsUndefined objects increases
2. MasqueradesAsUndefined is only used for HTMLAllCollection right now
3. HTMLAllCollection is ObjectType

So, what do we think of folding this information into JSType, and free up MasqueradesAsUndefined TypeInfo flag space?
We can introduce MasqueradesAsUndefinedObjectType for HTMLAllCollection.

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