[issue2759] Bool makes filter(None,it) redundant; remove None option?

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

It was deferred to me and I decided to keep the None argument as this 
is the standard way of spelling a missing argument.  Also, the None 
argument provides a pretty good clue that a special fast path is being 
taken.

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nosy: +rhettinger

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