[issue9120] Reduce pickle size for an empty set

[Raymond Hettinger]

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

Will think about this one for a while.  Initial reaction is that the case isn't common enough to care about, and that the 5 byte savings isn't worth the extra code path.

> By the same logic, allowing set() as an alternative 
> to set([]) in python code is "premature optimization".

That wasn't an optimization -- it was needed for API 
consistency with other types (i.e. list(), dict(), etc).
The zero argument form supports a use case for
polymorphic creation of an empty container regardless
of type.

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assignee:  -> rhettinger
nosy: +rhettinger

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