Unexpose broken Array.set_typed

[Mickeon]

• This method just does not work, look above.
• If it were to work, it would only work if the array is empty, is only referenced once, and is not already typed (which cannot be undone).
• At that point, you may as well either use the Typed Array constructor, or GDScript's static typing syntax.

[akien-mga]

This seems to be needed for GDExtension to implemented typed arrays:

In file included from /home/runner/work/godot/godot/godot-cpp/gen/include/godot_cpp/classes/object.hpp:42,
                 from /home/runner/work/godot/godot/godot-cpp/include/godot_cpp/classes/ref.hpp:36,
                 from /home/runner/work/godot/godot/godot-cpp/gen/include/godot_cpp/classes/animation_node.hpp:38,
                 from /home/runner/work/godot/godot/godot-cpp/gen/include/godot_cpp/classes/animation_node_time_scale.hpp:36,
                 from /home/runner/work/godot/godot/godot-cpp/gen/src/classes/animation_node_time_scale.cpp:33:
/home/runner/work/godot/godot/godot-cpp/include/godot_cpp/variant/typed_array.hpp: In constructor 'godot::TypedArray<bool>::TypedArray()':
Error: /home/runner/work/godot/godot/godot-cpp/include/godot_cpp/variant/typed_array.hpp:78:4: error: 'set_typed' was not declared in this scope; did you mean 'is_typed'?
   78 |    set_typed(m_variant_type, StringName(), Variant());                              \
      |    ^~~~~~~~~
/home/runner/work/godot/godot/godot-cpp/include/godot_cpp/variant/typed_array.hpp:82:1: note: in expansion of macro 'MAKE_TYPED_ARRAY'
   82 | MAKE_TYPED_ARRAY(bool, Variant::BOOL)
      | ^~~~~~~~~~~~~~~~

CC @bruvzg, ref. #65817.

[akien-mga]

CC @vonagam @jordigcs - this is core but closely related to your work on typed arrays.

[vonagam]

If it is required for GDExtension to work then what is the question?

[akien-mga]

I don't know if it is, waiting for @bruvzg's input on this.

There's no question, it's just an area adjacent to what you're working on on which you may have an opinion. E.g. on whether it is indeed "broken" or whether it can, has or should be fixed.

[bruvzg]

It's not broken, but it is only supposed to be called from the constructor, so it's probably should move to the GDExtensionInterface structure and not exposed to the GDScript (it's not usable from the script).

[YuriSizov]

Superseded by #71989.