Index of the payload array on which the operation is performed. Set to -1 for the entire content of the payload.
For floats, integers, and colors, it is the nth element of the array. For strings, it is the nth element of the comma-text.
In chunk modules, the item names are case sensitive. This means that item1 is not equivalent to Item1 or ITEM1.
To avoid mismatch between names and RegEx ^, ., $, *, +, ?, (, ), [, ], {, }, \, | are not allowed in the names.
version 7.0.250121
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