@Override
  public boolean equals(Object o) {
    if (this == o) return true;
    if (!(o instanceof FunctionalExpressionKey)) return false;

    FunctionalExpressionKey key = (FunctionalExpressionKey)o;

    if (lambdaParameterCount != key.lambdaParameterCount) return false;
    if (lambdaReturnType != key.lambdaReturnType) return false;
    if (!knownType.equals(key.knownType)) return false;

    return true;
  }
@Override
  public boolean equals(Object o)