text: 'use strict';
  
  const constants = exports;
  
  // Helper
  constants._reverse = function reverse(map) {
    const res = {};
  
    Object.keys(map).forEach(function(key) {
      // Convert key to integer if it is stringified
      if ((key | 0) == key)
        key = key | 0;
  
      const value = map[key];
      res[value] = key;
    });
  
    return res;
  };
  
  constants.der = require('./der');
  