Empty list compared to empty list returns null

[bryantaustin13]

Empty list compared to empty list returns null instead of true
To dupe:

<?xml version="1.0" encoding="utf-8"?>
<tests xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://hl7.org/fhirpath/tests" xsi:schemaLocation="http://hl7.org/fhirpath/tests ../../testSchema/testSchema.xsd"
	   name="CqlListOperatorsTest">
	<group name="SingleTest" version="1.0">
		<test name="EqualEmptyListAndEmptyList" version="1.0">
			<capability code="list-operators" />
			<expression>{} = {}</expression>
			<output>true</output>
		</test>
	</group>
</tests>

actual returned; null