Pierre Barbier de Reuille wrote:

> So, what I would suggest is to drop the user-defined augmented
> assignment and to ensure this equivalence :
> 
> a X= b <=> a = a X b
> 
> with 'X' begin one of the operators.

It can be done, but it's unnecessary for mutable objects like
sets or lists. A new object must be created in these cases where
one would suffice.

Reinhold
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