We could have forward part include all of method signatures/attributes which is 
what a type checker needs. In theory we could do,

forward class Foo:
  x: int
  y: list[str]
  
  def __init__(self, ...)

  def process(self, data: list[float]) -> float: ...

and then later do continue class. If we're willing to write a full header 
equivalent of c++ then I think static typing side will work. It'll be a lot 
more verbose then normal that I'd probably pick other solutions, but I it 
should make it tractable for a type checker.
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