Adding through recursion

[Micah Elliott]

On Nov 19, Ben Finney wrote:
    ...
> This is just one of many reasons why I advocate always having a
> *single* return statement, at the *end* of the function.

Agreed that it's a good *general* practice, but sometimes early exit
is useful and clear.

This is somewhat of a religious topic.  A good discussion is:
http://c2.com/cgi/wiki?SingleFunctionExitPoint

pychecker warns of fall-off-the-end functions.

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