change equality check to strict equality

because OCD.

Author: ansuz

diffDOM.js

@@ -448,12 +448,12 @@
  },
  i;
 
- if (typeof options == "undefined") {
+ if (typeof options === "undefined") {
  options = {};
  }
 
  for (i in defaults) {
- if (typeof options[i] == "undefined") {
+ if (typeof options[i] === "undefined") {
  this[i] = defaults[i];
  } else {
  this[i] = options[i];