[GDScript] Correctly report invalid read-only access #89648
Merged
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This ensures that read-only assignments are reported correctly, initially tried a fix using the setter system but it added a lot of extra complexity that wasn't helpful, so went with an explicit check on the script side using a new function on
Variant
, and added to a number of places in the VM, unsure if all these are needed but added them anywhere there was a set operation