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  • Committer: John Arbash Meinel
  • Date: 2009-10-12 17:07:05 UTC
  • mto: This revision was merged to the branch mainline in revision 4736.
  • Revision ID: john@arbash-meinel.com-20091012170705-g1v51yp2kfve4f0r
Add a comment to help Matthew Nordhoff understand why we have:

_empty_tuple = None
_empty_tuple = StaticTuple()

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doc/developers/diff.txt
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that only certain files should be compared.
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Performance can be further improved by caching comparisons to avoid repeating
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them.  Caching could potentially be performed by ``diff`` and perhaps by
 
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them.  Caching could potentially be performed by ``diff`` and perhaps by 
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``merge``.  Merge is aware of the relationship of a text merge's result to
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the THIS value, and the THIS value is generally the basis value.  So the
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comparison is latent, but present.  The only issue is extracting it.