Matt Wozniski af6d70e7f4 Validate the attr map only once per run
Before, each call to s:attr_map() would make sure that the things being
mapped from and to were valid.  Optimize this by making sure all at once
that all things being mapped from, and all things being mapped to, are
valid, before using any attributes.
2009-03-28 21:00:18 -04:00
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