Only check one parent for recursive list assignment #218
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When looking to see if a list assignment is nested, we use recursion to check each parent list. However, for each level of nested list, we were checking all of the parents. This is unnecessary since the recursion means that each parent will check its own parent, and so on.
This PR only changes the check to only one level of nesting per recursion.
Props to @Levivb for noticing this performance issue!