Not defaulting to the native type rationale:
Defaulting to the native type is less than useful, as:
* There are very few native types that are extensible and have static methods.
* Defaulting to the native type does not account for a method being script-defined.
While the "real fix" would be to carefully track the source of the method, the get_function_signature method is already complicated enough.
This will at least ensure the resulting code should always be valid.
Not triggering on self-calls rationale:
Found in PR comment https://github.com/godotengine/godot/pull/85918#issuecomment-1935864459
```
static func example():
pass
func example2():
example() # self-call on static function
```
Disabling this warning on self-calls is:
* Consistent with other languages
* Important for anonymous classes (where the output code is unusable)
- Allow identifiers similar to keywords if they are in ASCII range.
- Allow constants to be treated as regular identifiers.
- Allow keywords that can be used as identifiers in expressions.
This is using an adapted version of UAX#31 to not rely on the ICU
database (which isn't available in builds without TextServerAdvanced).
It allows most characters used in diverse scripts but not everything.
changed RETURN_VALUE_DISCARDED GDscript warning text to mention how the return value of a function is discarded; update GDScript parser warning test to include new warning text.
This makes sure that assigning values to enum-typed variables are
consistent. Same enum is always valid, different enum is always
invalid (without casting) and assigning `int` creates a warning
if there is no casting.
There are new test cases to ensure this behavior doesn't break in
the future.
