code: function convertMap(handler) {
    return function (data) {
      if (!handler) return data || {};
      return Object.keys(data || {}).reduce(function (memo, key) {
        memo[key] = handler(data[key]);
        return memo;
      }, {});
    };
  }
docs: Create a serialization handler to run if specified.
  
  @param {ObjectConversionHandler} handler - handles the conversion of the values of an object
  @returns {ConversionMapper} - a wrapper that will iterate across the object given and pass the values to the handler