Mark Dickinson <dicki...@gmail.com> added the comment:

> Seems so, for a static typing.  But Python is a dynamically typed
> language, isn't?

I think we're talking at cross purposes. Static and dynamic typing have nothing 
to do with this.

What do you think the result of `1.0 + Decimal(1)` should be, and more 
importantly why? Possible options are:

- Decimal('2')
- 2.0 (a float)
- a `TypeError` (as now)
- some kind of horrible user-configurable-global-state-dependent answer

Bear in mind that you have to pick a behaviour that's a good default choice for 
all potential application domains, and that's *hard*. ("In the face of 
ambiguity ...", and all that.)

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<https://bugs.python.org/issue43602>
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