How do I do a query with case insensitive?

Summary:

I'm using the Get Workers endpoint with a filterCriterion on the DisplayName field.

I've encountered an interesting issue: when I enter " rob" in lowercase, I get 0 results, but typing "ROB" yields 22 results.

I'm mapping my input search variable to the filterCriterion. How can I make the filterCriterion case insensitive?

I noticed in inspect element its converting it to a q parameter.

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