GeoJson Feature property with null value becomes "null" as string literal when querying rendered features

[Bernoulli-IT]

mapbox-gl-js version: 1.11.0

browser: Chrome

Steps to Trigger Behavior

1. Set source data with a GeoJson FeatureCollection
2. The collection contains at least one feature with a property with a null value
3. Query rendered features and inspect the property, its value has become a literal "null" string

Expected Behavior

The value should remain as null.

Actual Behavior

The value became "null" as a literal string.

Example

Start of a GeoJson file.

{
"type": "FeatureCollection",
"features": [
{
"type": "Feature",
"id": "NLWMO002360566200097",
"properties": {
"bridgeDetails.vild": null,
...

Property inspected with Chrome inspector:

bridgeDetails.vild: "null"

Is this behavior by design? It looks odd. And needs some additional client-side cumbersome handling when expecting feature properties to be possibly null instead of "null".

[ryanhamley]

This is a duplicate of #8497 Closing to focus discussion there