Fix duplicate indices in ExprIndices

[UnderscoreTud]

Problem

Trying to get the indices of a list that has a sublist of multiple values, will return the index for that sublist multiple times.

set {_list::sublist::*} to 1 and 2
broadcast indices of {_list::*} # 'sublist and sublist`

Solution

Ensure all the keys returned by the expression are unique

Testing Completed

ExprIndices.sk and manual testing

Supporting Information

N/A

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Completes: none
Related: none
AI assistance: none