Ethan Furman added the comment:

Ah, I see.

So you say up-front if you are willing to have redefinition occur later.

That doesn't feel like a consenting-adults attitude, and could also make 
testing harder.

I prefer adding an option to the register method, and move towards making the 
default be "don't allow".

If we don't want to go that route, would having singledispatch issue a warning 
on redefinition be sufficient?

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<http://bugs.python.org/issue24597>
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