jasondavies/d3 — comment on commit ebab983b8a644b4e5a7fe3d392be67d44c3e900b
File: src/core/interpolate.js line 196
By jasondavies:

Hmm, I assumed we only really wanted to interpolate "enumerable" properties (ones that can be enumerated via for…in), like in the original behaviour. Yes, I think if you are interpolating `__proto__`, you may have other problems. :) At least this fixes the quite possible case where someone might have a key called "watch" in Firefox.