PVInstance can't cast to Instance

[CodeProto (Code)]

This is an issue I’ve been having.
A PVInstance like a BasePart will not be capable of casting to an Instance type.
Is this intended behaviour?
I sure would understand the other way around wouldn’t work, but from PVInstance to Instance?
What makes it incapable of casting?

RaycastParams.FilterDescendantsInstances needs {Instance} and doesn’t accept {PVInstance} and {PVInstance} lacks the capability to cast to {Instance}

Expected behavior

I would expect a PVInstance to cast to Instance just fine, though I once again have my doubts about the intended behaviour.

Edit: I have my doubts about the bug reporting category, if this falls under Studio or Engine bugs.

[Focia19]

This is just an acknowledgment announcement!

We’ve filed a ticket into our internal database for this issue, and we will update you when we have further information!

Thanks for the report!

[fun_enthusiast]

This is expected behaviour.

The reason we must warn here is that Luau cannot know if you are going to mutate RaycastParameters.FilterDescendantsInstances or not. Since its type is {Instance}, it would be permissible to insert a Folder into the array, and then your {BasePart} would contain things that are not BaseParts at all.

We have a feature in mind to help out in this situation, but it will be a little while before it is ready. In the meantime, you can work around this by casting Settings.Parts :: any.