_obj.toString blows up with emojis

[d4rkr00t]

encodeURI blows up for some _obj:

diff-match-/javascript/diff_match__uncompressed.js

Line 2186 in a6367d7

diff_match_._obj..toString = function() {

Example:

let diff_match_ = require("diff-match-");

let text1 = "🅱";
let text2 = "🅰";

let diff = new diff_match_();
console.log(diff._toText(diff._make(text1, text2)));