return RANDOM_SOURCE.nextBoolean() ? result : result.negate();
  }

  /**
   * Chooses a number in (-2^numBits, 2^numBits) at random, with density concentrated in numbers of
   * lower magnitude.
   */
  static BigInteger randomBigInteger(int numBits) {
    while (true) {
      if (RANDOM_SOURCE.nextBoolean()) {
        return randomNonNegativeBigInteger(numBits);
      }

                .version("version" + Long.toHexString(entropy.nextLong()))
                .build();
        Activation a = Activation.newBuilder()
                .activeByDefault(entropy.nextBoolean())
                .jdk("jdk" + Long.toHexString(entropy.nextLong()))
                .file(af)
                .property(ap)
                .os(ao)
                .packaging("pom")
                .build();