// safely publish these objects and we won't need this whole discussion.
  // TODO(user,lukes): consider adding volatile to all these fields since in current known JVMs
  // that should resolve the issue. This comes at the cost of adding more write barriers to the
  // implementations.

  private Futures() {}

  /**

        return inputSet.keySet().equals(that.inputSet.keySet());
      }
      return super.equals(obj);
    }

    @Override
    public int hashCode() {
      /*
       * The sum of the sums of the hash codes in each subset is just the sum of
       * each input element's hash code times the number of sets that element
       * appears in. Each element appears in exactly half of the 2^n sets, so:
       */

 *  Fix: Don't reuse connections after an unsuccessful `Expect: 100-continue`.
 *  Fix: Handle either `TLS_` or `SSL_` prefixes for cipher suite names. This is necessary for
    IBM JVMs that use the `SSL_` prefix exclusively.
 *  Fix: Reject HTTP/2 data frames if the stream ID is 0.
 *  New: Upgrade to Okio 1.12.0.

     ```xml
     <dependency>
       <groupId>com.squareup.okio</groupId>

      return false;
    }

    // This implementation is patterned after ConcurrentHashMap, but without the locking. The only
    // way for it to return a false negative would be for the target value to jump around in the map
    // such that none of the subsequent iterations observed it, despite the fact that at every point
    // in time it was present somewhere int the map. This becomes increasingly unlikely as