[issue3069] Let set.union and set.intersection accept multiple arguments

[Raymond Hettinger]

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

Time machine -- I already put in a version of this last night.  See 
r64051 and r64055.

Will take a look at your code to see if I can incorporate the sorting 
for insection() and harvest it for more tests.

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assignee:  -> rhettinger
nosy: +rhettinger

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