Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

Also note that functools.singledispatch depends on type annotations being 
present.¹𝄒²
 
¹ https://docs.python.org/3/library/functools.html#functools.singledispatch
² https://forum.dabeaz.com/t/singledispatch-and-the-visitor-pattern/395

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