undefined property not being propagated to UI

[jklimcak]

Let's say I send objects as part of my extra arguments, something like:

 {
    "prop1": "val1", 
    "prop2": "val2", 
    "prop3": "val3", 
}

If one of those values turns out to be undefined, e.g.:

 {
    "prop1": "val1", 
    "prop2": undefined, 
    "prop3": "val3", 
}

That value won't show up in Rollbar, the raw JSON in the occurrence would show:

 {
    "prop1": "val1", 
    "prop3": "val3", 
}

Is this known and expected? We'd certainly prefer for it to be propagated and shown.