code: function stringify(value) {
    "use strict";
  
    if (typeof value === 'function') {
      return value.toString();
    }
    return value !== undefined ? JSON.stringify(value) : "undefined";
  }
docs: A thin wrapper around JSON.stringify:
  
  - `undefined` gets evaluated to "undefined"
  - a function gets evaluated to source code
  
  @param {Object} value
  @returns {string}