Async boolean bug

[fongsean]

Hi,

Was just experimenting with memberOf() in Brian's fhirpath-lab. He's using v3.15.1 which is pretty up to date.

MedicationRequest memberOf example

If I set the terminology server to https://tx.ontoserver.csiro.au/fhir, the FHIRPath expression works nicely and produces a result of true.
(Settings button on the top right -> FHIR Terminology Server -> "https://tx.ontoserver.csiro.au/fhir" -> Save)

Problem

If I add " or true" to the end of the FHIRPath expression, the result remains as true.

If I add " or false" to the end of the FHIRPath expression, the result becomes empty.

• Expected result: true

If I set the FHIRPath expression as "{expression} or {expression}", the result becomes empty.

• Expected result: true

.NET implementation comparison

The .NET implementation produces correct results for all three test cases above.