code: function objectToFunction(obj) {
    var match = {};
    for (var key in obj) {
      match[key] = typeof obj[key] === 'string'
        ? defaultToFunction(obj[key])
        : toFunction(obj[key]);
    }
    return function(val){
      if (typeof val !== 'object') return false;
      for (var key in match) {
        if (!(key in val)) return false;
        if (!match[key](val[key])) return false;
      }
      return true;
    };
  }
docs: Convert `object` to a function.
  
  @param {Object} object
  @return {Function}
  @api private