No way to get Gd<Self> without casting

[MatrixDev]

AFAIK the only way to get Gd<Self> is to use base as base.share().cast().

impl NoiseEmitter {
    fn f_ready(&mut self) {
        self.get_character().bind_mut().noise_emitter = Some(self.base.share().cast());
    }
}

But not taking to account cast overhead this is not safe and can lead to runtime bugs that ideally should be caught during compilation:

impl NoiseEmitter {
    fn f_ready(&mut self) {
        // notice that the field is '_receiver', but we're assigning '_emitter'
        self.get_character().bind_mut().noise_receiver = Some(self.base.share().cast());
    }
}

It would be nice if #[derive(GodotClass)] automatically generated Self-typed share method for such cases:

// generated
impl GodotClass for NoiseEmitter {
    pub fn share(&self) -> Gd<Self> {
        // TODO, ideally implemented without casting overhead but this is nitpicking
    }
}

[Bromeon]

Thanks for the use case and description!
Something along those lines was the 2nd suggestion in #131.

[Bromeon]

Implemented as self.to_gd().

#497