UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.13 Safari/537.36

Steps to reproduce the problem:
1. Use this form for passing, say, googEchoCancellation as an advanced audio param to getUserMedia():

advanced: [
  {
    googEchoCancellation: {exact: true},
  },
]

2. Examine the resulting value in the "GetUserMedia Requests" tab at chrome://webrtc-internals

What is the expected behavior?
The resulting "Audio Constaints" value in the "GetUserMedia Requests" tab at chrome://webrtc-internals is:

advanced: [
  {
    googEchoCancellation: {exact: true},
  },
]

What went wrong?
The resulting "Audio Constaints" value in the "GetUserMedia Requests" tab at chrome://webrtc-internals is:

advanced: [
  {
    googEchoCancellation: {exact: false},
  },
]

Did this work before? N/A 

Does this work in other browsers? N/A

Chrome version: 61.0.3163.13  Channel: dev
OS Version: OS X 10.12.5
Flash Version: 

If I use this form:

advanced: [
  {
    googEchoCancellation: true,
  },
]

Then examining the resulting "Audio Constaints" value in the getUserMedia request output at chrome://webrtc-internals, it is passed correctly:

advanced: [
  {
    googEchoCancellation: {exact: true},
  },
]

Is the first form not officially supported? I would think it should be, given that's how it is expressed in the final object.