Terry Jan Reedy tjreedy at udel.edu
Thu May 23 01:16:01 CEST 2013

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I like the general idea. Does you have any specific stdlib use cases in 
mind?

I thought of pprint, which at some point dispatches on dict versus 
set/sequence, but overall it seems more complicated than mere arg type 
dispatch.

Unittest.TestCase.assertEqual mostly (but not completely) uses first arg 
dispatch based on an instance-specific dict, and it has an custom 
instance registration method addTypeEqualityFunc. (Since each test_xxx 
runs in a new instance, a registration for multiple methods has to be 
done either in a setup method or repeated in each test_method.)

Terry

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