function pairs(object) {
  object = toObject(object);

  var index = -1,
      props = keys(object),
      length = props.length,
      result = Array(length);

  while (++index < length) {
    var key = props[index];
    result[index] = [key, object[key]];
  }
  return result;
}
Detect lack of support for accessing string characters by index.

IE < 8 can't access characters by index. IE 8 can only access characters
by index on string literals, not string objects.

@memberOf _.support
@type boolean