[Buildbot] #3321: make compare_attrs type consistent

[Buildbot trac]

#3321: make compare_attrs type consistent
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Reporter:  ewong      |       Owner:  ewong
    Type:  undecided  |      Status:  assigned
Priority:  minor      |   Milestone:  undecided
 Version:  0.8.12     |  Resolution:
Keywords:             |
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Comment (by ewong):

 ComparableMixin uses reflect.accumulateClassList to do this, so if tuples
 were
 used, wouldn't we need to create a accumulateClassTuple?

 Either way we choose, this is still going to break a lot of code, am I
 right?

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Ticket URL: <http://trac.buildbot.net/ticket/3321#comment:4>
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