Hi Armin,

when I added a few tests for the new variable step variant,
I observed the following behavior of ranges:

When a variable is conditionally assigned two different ranges,
the ranges are kept, unless the steps are different.
Well, after all this is not too surprizing, since we are compiling
the step constant in.
But I thing the action taken is not so pleasant:
The range is turned into a list in this case!

I guess what we want is either special-casing the respective blocks,
or at least map this to the variable step case, if this is possible.

I would like to understand why the annotator thinks this must
become a list, and how I can convince it to take a different action.
I think, using the variable variant would be adequate in this case.
A test_range_funny was added to test_rrange.py, not really
meant as a test, but to explain that.

Please let me know what you think.

cheers - chris

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