Patch to restore basis.data.Value#updateCount (dropped in 0.9.4)

basis.data.Value#updateCount.js

basis.require('basis.data');

(function(){
  var emit_change_ = basis.data.Value.prototype.emit_change;
  basis.data.Value.extend({
    updateCount: 0,
    emit_change: function(){
      this.updateCount += 1;
      emit_change_.apply(this, arguments);
    }
  });
})();