Hi Yahbai

You might wish to reconsider your proposal in light of existing behaviour
>>> 1+-1
0

Consider also your proposed
>>> a, b = 2 +- 1
We know that {a, b} = {1, 3}. But which is which?

In your use case you might be better off introducing a custom type
>>> lims = pm(2, 1)
>>> lims.lo, lims.hi
(1, 3)

I hope this helps you with your code.

best wishes

Jonathan
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