Quote:
Originally Posted by chaley
That is because series indices aren't real columns, custom or otherwise. Every series-type column 'lookup_name' has an associated virtual column 'lookup_name_index', added automatically when the series-type column is added to field metadata. The value of that virtual column comes either from the book record (series) or from the series link table (#series).
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I had an Action Chains template function that needed the is_custom to return true for custom_series_index virtual columns. So I, foolishly, made a function that modified the dictionary, forgetting to make a deepcopy of the object beforehand. It
backfired spectacularly 
.