code: function(that, key){                                                                  // 32
    // fast case                                                                                       // 33
    var index = fastKey(key), entry;                                                                   // 34
    if(index !== 'F')return that._i[index];                                                            // 35
    // frozen object case                                                                              // 36
    for(entry = that._f; entry; entry = entry.n){                                                      // 37
      if(entry.k == key)return entry;                                                                  // 38
    }                                                                                                  // 39
  }
docs: 30 31