Comment #24 on issue 2070 by asmeu...@gmail.com: All elements of .args
should be Basic
http://code.google.com/p/sympy/issues/detail?id=2070
It's not performance. It's just really nice to know that you can take any
element of .args and apply the Basic interface to it. This makes recursive
algorithms on Basic really easy.
If you want a leaf to be an int, why not just use an Integer? If you want
a leaf to be a string, why not create a simple Basic subclass for a string?
There was a lot of discussion about this on the mailing list about a year
ago. I forgot if you were a part of it. You might look at what was said
there (most of it was started by Stefan, if you are having difficulty
finding it).
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