Ambiguous call to operator error with QiCore function overload

[c-schuler]

The following CQL results in an Ambiguous call to operator 'isCommunity(org.hl7.fhir.r4.model.MedicationRequest)' error at runtime:

define fluent function isCommunity(medicationRequest MedicationRequest):
  exists (medicationRequest.category C
    where C ~ Community
  )

define fluent function isCommunity(medicationRequest MedicationNotRequested):
  exists (medicationRequest.category C
    where C ~ Community
  )

This code worked in v3.15.0. The following update appears to have introduced this issue.

I’ve already tried setting the signature level to Overloads using:
evaluationSettings.getCqlOptions().getCqlCompilerOptions().setSignatureLevel(LibraryBuilder.SignatureLevel.Overloads);
but this didn’t resolve the issue.

The apparent challenge here is that these are legitimately different signatures in CQL, but not in ELM. The ELM shows the same resultType for the medicationRequest operand, being {http://hl7.org/fhir}MedicationRequest.