Firefox mutation warning

[Y-Less]

I'm submitting a bug report

• Library Version:
  1.0.2 (guess - I got it from this repo a few days again).

Please tell us about your environment:

• Operating System:
  Windows 7

• Node Version:
  N/A

• NPM Version:
  N/A

• JSPM OR Webpack AND Version
  N/A

• Browser:
  Firefox 46.0.1

• Language:
  ESNext

Current behavior:
I get the following warning in Firefox's console:

mutating the [[Prototype]] of an object will cause your code to run very slowly; instead create the object with the correct initial [[Prototype]] value using Object.create
aurelia-core.min.js:4:21492

Expected/desired behavior:

• What is the expected behavior?
  No prototype modifications.
• What is the motivation / use case for changing the behavior?
  Speed.

[EisenbergEffect]

It's just a warning, and it's related to polyfills.