[Webkit-unassigned] [Bug 250107] New: [Wasm-GC] Add support for final attribute

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=250107

            Bug ID: 250107
           Summary: [Wasm-GC] Add support for final attribute
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebAssembly
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: asumu at igalia.com

In https://github.com/WebAssembly/gc/pull/339, a new feature was added to the Wasm GC spec that allows `sub` clauses to be declared final (no subtypes allowed).

It also changes the default so that shorthand declarations are final and an explicit non-final `sub` must be used to allow subtyping.

The JSC implementation needs to be updated to accommodate finality.

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