[MCPE-145798] "isNaN" not working in GameTest framework

For some odd reason, the function "isNaN" no longer works in GameTest scripts as of 1.17.40. It always returns false, even the value passed in is `NaN`.

Steps to Reproduce:

Make a behaviour pack with a Gametest script that does the followings (Updated for 1.18.10):
```
world.getDimension('overworld').runCommand(`say ${isNaN(NaN)}`);
```

Import the pack to a world (Gametest framework enabled) and run it.

Observed Results:

Chat says

false

Expected Results:

Chat should say

true

Notes:

Fortunately this can worked around by comparing the value to itself, but it would be great if a common function such as this works as intended.

Comments 2

kiizde 2021-12-07T12:36:55Z

Thank you for your report!
However, this issue has been temporarily closed as Awaiting Response

Is this still an issue in the latest version? If so, can you please add it to the affected versions (or mention it if you are not the reporter).

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SIsilicon 2022-02-11T00:31:15Z

Tested it in 1.18.10. Still prints false from `isNaN(NaN)`.