docs: function set(path, value, opts) {
    if (typeof opts === 'undefined') {
      opts = {};
    }
  
    let env = toUnderscore(path);
    if (!opts.caseSensitive) {
      env = env.toUpperCase();
    }
  
    del(path, opts);
    process.env[env] = stringify(value, opts);
  }