Template objects are eternal when put into WeakMap · Issue #840 · tc39/ecma262
As with all fun things this came out of a discussion with @anba and @arai-a. We ran into it as I was fixing template object canonicalization in Firefox. So GetTemplateObject canonicalizes template objects using a realm-wide template registry. I assume the intention is to allow this registry to be implemented internally as a weak map: if the template object itself is GCed, then the identity of the
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