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Actually, I'm not convinced that the templates should be 
private, though I can certainly see protected.  (double-
underscore private is mangled; single-underscore protected will 
be left out of some imports and doco, but acts like a regular 
variable if people choose to use it anyway.)

I'm still thinking about nnorwitz's suggestion; the config option 
could be ignored by most people ("use the defaults") but would 
hold persistent state for people with explicit preferences (since 
they'll probably want to make the same changes to all 
compares).