<p>I have a hazy memory that the code was originally written to make ways with large numbers of nodes invalid, but such ways exist in the history and <em>were</em> valid when they were created. So the code was changed to validate new versions of ways only with <code>preconditions_ok?</code>.</p>
<p>I think it would be better to do it with <code>valid?</code> on the model, as that seems more likely to give us universal coverage of all code paths. It's possible that, by now, no current version of any way would have an invalid number of nodes, so this could be on <code>Way</code> and left off <code>OldWay</code>?</p>
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