Creates N-level grouping of items using given grouping selector in the order provided.
a Map of Map ... of Map<string, item> with the first map containing a single element called root.
array of items to groups
array of selectors
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Creates N-level grouping of items using given grouping selector in the order provided.
Returns
a Map of Map ... of Map<string, item> with the first map containing a single element called root.