docs: function getKey(key) {
    if(this.conf.transform) {
      if(typeof(this.conf.transform.key) == 'function') {
        return this.conf.transform.key.call(this, key);
      }
    }
    key = delimited(key, this.conf.delimiter);
    key = key.replace(/- /, this.conf.delimiter);
    key = key.replace(/[^a-zA-Z0-9_]/, '');
    if(this.conf.prefix) {
      return this.conf.prefix + this.conf.delimiter + key.toLowerCase()
    }
    return key.toLowerCase();
  }