[BUGFIX release] Make ArrayProxy Lazy #18770
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This PR refactors ArrayProxy to only begin observing the proxied array's changes the first time the proxy is actually used. This fixes a number of bugs that have popped up recently, and also ensures that ArrayProxy creation does not accidentally entangle with the autotracking stack. It also simplifies the code overall, and conceptually is more in line with the way that autotracking works. In addition, it adds a CUSTOM_TAG_FOR to the proxy, to forward the `[]` and `length` tags from its content directly rather than attempting to managed them itself. This keeps the system from encountering issues related to tag updates, and from needing to re-notify when changes are propagated. As part of fixing this, I also discovered that the `hasArrayObservers` API has been broken since ~3.11. I fixed it and added a test.
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This PR refactors ArrayProxy to only begin observing the proxied array's
changes the first time the proxy is actually used. This fixes a number
of bugs that have popped up recently, and also ensures that ArrayProxy
creation does not accidentally entangle with the autotracking stack. It
also simplifies the code overall, and conceptually is more in line with
the way that autotracking works.
In addition, it adds a CUSTOM_TAG_FOR to the proxy, to forward the
[]and
lengthtags from its content directly rather than attempting tomanaged them itself. This keeps the system from encountering issues
related to tag updates, and from needing to re-notify when changes are
propagated.
As part of fixing this, I also discovered that the
hasArrayObserversAPI has been broken since ~3.11. I fixed it and added a test.
Fixes #18763
Fixes #18750
Fixes #18773