[vim9script] Forward declarations for classes?

Consider the following example:

class Rgb
this.r: float
this.g: float
this.b: float

def ToHsv(): Hsv
# ...
enddef
endclass

class Hsv
this.h: float
this.s: float
this.v: float

def ToRgb(): Rgb
# ...
enddef
endclass

In a scenario like the above, the return type of ToHsv() must be changed
to `any`. Is a mechanism to make the above code legal being considered?

Of a similar flavour:

class X
def Clone(): X
# Return a copy of this
enddef
endclass

Currently, Clone() must be typed as `any`.

Thanks,
Life.

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