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Correction
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Resolution: Done
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Minor
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None
ambiguous handling of null in `IndexOf` specification
the spec states
"If the list argument is null, the result is null."
however the [test](https://github.com/cqframework/clinical_quality_language/blob/master/Src/coffeescript/cql-execution/test/elm/list/test.coffee#L178) effectivly asserts that if either argument is null then the result is null