docs: private Entry getEntry(Object key)
      {
          if (key == null) return null;
          int hash = hashCode(key);
          int index = indexFor(hash);
          for (Entry entry = table[index]; entry != null; entry = entry.next)
          {
              if ((entry.hash == hash) && equals(key, entry.getKey()))
              {
                  return entry;
              }
          }
          return null;
      }