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Hi folks,

Just a suggestion for a documentation tweak. Currently the docs for len() on a set say this:

.. describe:: len(s)

Return the cardinality of set \*s\*.

I'm a relatively seasoned programmer, but I don't really have a maths background, and I didn't know what "cardinality" meant. I could kind of grok it by context, but could we change this to something like the following?

.. describe:: len(s)

Return the number of elements in set \*s\* (cardinality of \*s\*).