4.0 Packed*Array pass by reference

[cdemirer]

Your Godot version:
latest - 4.0.dev (dcd2364da)

Issue description:
In Built-in types section, it says:

(Packed arrays such as PackedByteArray are still passed as values.)

However, the current & (as far as I know) expected behavior is that they pass by reference in almost all cases.
It might be the case that they pass by value when provided as an argument to non-gdscript functions only: godotengine/godot#36492 (comment)

URL to the documentation page:
https://docs.godotengine.org/en/latest/tutorials/scripting/gdscript/gdscript_basics.html#built-in-types

[tetrapod00]

Closing as fixed in #7603.