OK, figured it out. About the only way I can see to do it in DTML is this:

   <dtml-call "col[index1].insert(index2, col[index1].pop(index2)+1)">

This command happens to increment the value at col[index1][index2], and this
strategy allows any operation to be done on the value. It appears to be
quite fast as well, so I'm content.


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