Obfuscated parameter names "oldTrack" and "newTrack" for "adaptation" and "variantchangeds" events

[Pereverzev-Alexander]

Have you read the FAQ and checked for duplicate open issues?
Yes

What version of Shaka Player are you using?
3.2.0.compiled and 3.2.1.compiled

Can you reproduce the issue with our latest release version?
Yes

Can you reproduce the issue with the latest code from master?
Not checked

Are you using the demo app or your own custom app?
Own custom app

If custom app, can you reproduce the issue using our demo app?
No

What browser and OS are you using?
Ubuntu 21.04, Firefox 93.0, Chrome 90.0.4430.72

What are the manifest and license server URIs?
Manifest: https://dash.akamaized.net/akamai/bbb_30fps/bbb_30fps.mpd

What did you do?

1. Add a listener to the "adaptation" event
2. Start stream playback
3. When the event is triggered, the event handler gets a obfuscated name for the parameters oldTrack and newTrack: ("zf" and "yf" instead of "oldTrack" and "newTrack")

The same problem for variantchanged event.

Example of received event parameters:
{
bubbles: false
cancelable: false
currentTarget: W {rc: pd, qc: W, l: 0, g: null, oc: null, …}
defaultPrevented: false
g: false
isTrusted: false
target: W {rc: pd, qc: W, l: 0, g: null, oc: null, …}
timeStamp: 5425.795000001017
type: "adaptation"
yf: {id: 8, active: false, type: "variant", bandwidth: 1950771, language: "und", …}
zf: {id: 6, active: false, type: "variant", bandwidth: 1321829, language: "und", …}
}

What did you expect to happen?
Expected event parameter names:
{
oldTrack: {id: 6, active: false, type: "variant", bandwidth: 1321829, language: "und", …}
newTrack: {id: 8, active: false, type: "variant", bandwidth: 1950771, language: "und", …}
bubbles: false
cancelable: false
currentTarget: W {rc: pd, qc: W, l: 0, g: null, oc: null, …}
defaultPrevented: false
g: false
isTrusted: false
target: W {rc: pd, qc: W, l: 0, g: null, oc: null, …}
timeStamp: 5425.795000001017
type: "adaptation"
}

[theodab]

Thanks for the report!