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Description of fn:index-of contains this paragraph: The items in the sequence $seqParam are compared with $srchParam under the rules for the eq operator. Values that cannot be compared, i.e. the eq operator is not defined for their types, are considered to be distinct. If an item compares equal, then the position of that item in the sequence $srchParam is included in the result. In the final sentence, $srchParam should be $seqParam.
Thanks! Fixed.