[BUG] Fhirpath treats `not-equal-to` operation as `equal-to`

Describe the bug It seems that fhirpath doesn't work correctly for equality != operation. I use it JUTE mappings.

Severity

Steps to reproduce the behavior:

POST /Mapping/$debug

mapping:
  body:
    $let:
      answerLinkId: $ fhirpath("QuestionnaireResponse.repeat(item).where(linkId!='next-informative-message-question').where(answer).linkId").0
      patient: $ fhirpath("QuestionnaireResponse.subject")
    $body:
      type: transaction
      entry:
        - request:
            url: /ChatSuggestionHistory
            method: POST
          resource:
            patient: $ patient
            suggestion: $ answerLinkId
            derivedFrom:
              id: $ fhirpath("QuestionnaireResponse.id")
              resourceType: QuestionnaireResponse
            resourceType: ChatSuggestionHistory
  id: informative-message-extract
  resourceType: Mapping
scope:
  item:
    - answer:
        - value:
            string: informative-message-workout
      linkId: next-informative-message-question
    - text: >-
        The air quality isn't great right now.
      linkId: informative-message-air-pollution
    - text: >-
        Yeah to you! It looks like you are doing a great job working out.
      answer:
        - value:
            Coding:
              code: acknowledge
              system: https://api.juli.co/code-systems/informative-message
              display: Got it
      linkId: informative-message-workout
  status: completed
  subject:
    id: 66b00713-81a1-45f0-96c9-7896b17aade6
    resourceType: Patient
  questionnaire: informative-message
  resourceType: QuestionnaireResponse

The result I get is below. Take a look at suggestion field, it should contain the result of this expression $ fhirpath("QuestionnaireResponse.repeat(item).where(linkId!='next-informative-message-question').where(answer).linkId").0.

And it does, but the result is wrong because I use != operation in where clause, but it seems that it treats it as =.

type: transaction
entry:
  - request:
      url: /ChatSuggestionHistory
      method: POST
    resource:
      patient:
        id: 66b00713-81a1-45f0-96c9-7896b17aade6
        resourceType: Patient
      suggestion: next-informative-message-question
      derivedFrom:
        id: >-
          [281e353d-33ee-4c48-a7cb-c936da905b2b](http://localhost:8080/ui/console#/rest?req=GET%20/QuestionnaireResponse/281e353d-33ee-4c48-a7cb-c936da905b2b)
        resourceType: QuestionnaireResponse
      resourceType: ChatSuggestionHistory

Expected behavior I should get informative-message-workout in suggestion field because it matches the fhirpath request.

Versions:

Aidbox image version: 2202 But I see that https://github.com/HealthSamurai/fhirpath.clj library haven't updated for a long time.

Additional context I tested this fhirpath expression using fhirparth.js (https://hl7.github.io/fhirpath.js/) and fhirpath-py and it works correctly.

Aidbox / Issues

[BUG] Fhirpath treats `not-equal-to` operation as `equal-to` #550