Steve Dower <steve.do...@python.org> added the comment:

But at least if it's available as a slot then a module is *able* to use it with 
limited ABI going backwards. A new function doesn't allow that.

And yeah, it means they have to write more complex code than just a static 
array definition, but people are willing and able to do it.

I don't think there's anything about the current FromSpec that suggests all the 
parameters have to be interpreter-agnostic. And the design does suggest that 
we'll add more later without having to break the ABI (otherwise it would be a 
regular struct).

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue15870>
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