distinct values() doesn't work for context items

[saig0]

Describe the bug
The built-in function distinct values() doesn't filter duplicates for a list of context items.

distinct values([{x:1},{x:2},{x:1}])

To Reproduce
Steps to reproduce the behavior:

1. Evaluate the expression

distinct values([{x:1},{x:2},{x:1}])

2. Verify that the result contains {x:1} twice

Expected behavior
The function distinct values() should filter duplicates for a list of context items.

distinct values([{x:1},{x:2},{x:1}])
// [{"x":1},{"x":2}]

Environment

• FEEL engine version: 1.17.3
• Affects:
  • Camunda Automation Platform 7: [7.x]
  • Zeebe broker: 8.3.3
• Support case: https://jira.camunda.com/browse/SUPPORT-23030