Json response returns booleans as stings

When returning from a API request or a function call where result schema has a boolean property, the resulted JSON has a string value instead of boolean.

Hope this is enough information to reproduce :)
Regards
Andreas

Expected behavior:

{
    "success": true,
    "message": "..."
}

Actual response:

{
    "success": "true",
    "message": "..."
}