For array fields inserts the one-based element number of the field currently being processed by the field loop. For multi-dimension arrays the token inserts a comma-separated list of current index numbers. For non-array fields the token inserts 0.
For a non-array field: 0
For a single-dimensional array: 1
For a two-dimensional array: 1,2
For a three-dimensional array: 1,2,3
For a four-dimensional array: 1,2,3,4
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