public Stats yStats() {
    return yStats.snapshot();
  }

  /**
   * Returns the population covariance of the values. The count must be non-zero.
   *
   * <p>This is guaranteed to return zero if the dataset contains a single pair of finite values. It
   * is not guaranteed to return zero when the dataset consists of the same pair of values multiple
   * times, due to numerical errors.
   *
   * <h3>Non-finite values</h3>
   *

    @Test
    @DisplayName("Test with edge case time values")
    void testWithEdgeCaseTimeValues() {
        // Test with various time values including edge cases
        long[][] timeValues = { { 0L, 0L, 0L, 0L }, // All zeros
                { Long.MAX_VALUE, Long.MAX_VALUE, Long.MAX_VALUE, Long.MAX_VALUE }, // Max values
                { 1L, 2L, 3L, 4L }, // Small values

            assertEquals(length, SMBUtil.readInt4(buffer, startIndex + 16));

            // Verify reserved bytes are zeros
            for (int i = 0; i < RESERVED_BYTES; i++) {
                assertEquals(0, buffer[startIndex + 20 + i]);
            }
        }

        @Test
        @DisplayName("Should encode zero values correctly")
        void testEncodeZeroValues() {
            // Given

And these models are all sharing a lot of the data and duplicating attribute names and types.

We could do better.

We can declare a `UserBase` model that serves as a base for our other models. And then we can make subclasses of that model that inherit its attributes (type declarations, validation, etc).

All the data conversion, validation, documentation, etc. will still work as normally.

        new SecureRandom().nextBytes(data);

        // Verify data is not all zeros initially
        boolean hasNonZero = false;
        for (byte b : data) {
            if (b != 0) {
                hasNonZero = true;
                break;
            }
        }
        assertTrue(hasNonZero, "Data should have non-zero bytes");

        SecureKeyManager.secureWipe(data);

        // Verify data is wiped

#    -X prop       set non-standard JAVA system property
#   --prop=val
#   --prop val     set fess property (i.e.  -Des.<prop>=<val>)

CDPATH=""
SCRIPT="$0"

# SCRIPT may be an arbitrarily deep series of symlinks. Loop until we have the concrete path.
while [ -h "$SCRIPT" ] ; do
  ls=`ls -ld "$SCRIPT"`
  # Drop everything prior to ->
  link=`expr "$ls" : '.*-> \(.*\)$'`
  if expr "$link" : '/.*' > /dev/null; then

        assertArrayEquals(testFileId, copiedFileId);
    }

    @Test
    @DisplayName("Test with various file ID patterns")
    void testWithVariousFileIdPatterns() {
        // Test with all zeros
        byte[] zeroFileId = new byte[16];
        Smb2FlushRequest zeroRequest = new Smb2FlushRequest(mockConfig, zeroFileId);
        testFileIdInRequest(zeroRequest, zeroFileId);

        // Test with all ones

        resp.decode(packet, 0);

        SrvPipePeekResponse peek = resp.getOutputData(SrvPipePeekResponse.class);
        assertNotNull(peek);
        assertEquals(16, resp.getOutputLength());
        // Default zeros
        assertEquals(0, peek.getNamedPipeState());
        assertEquals(0, peek.getReadDataAvailable());
        assertEquals(0, peek.getNumberOfMessages());
        assertEquals(0, peek.getMessageLength());
    }

            assertEquals((byte) 0xFF, dst[i]);
        }

        // Test with zero
        SMBUtil.writeInt8(0L, dst, 16);
        for (int i = 16; i < 24; i++) {
            assertEquals((byte) 0x00, dst[i]);
        }
    }

    @Test
    void testReadTime() {
        byte[] src = new byte[16];

        // Test with zero time
        SMBUtil.writeInt8(0L, src, 0);

   *         .addNode(REYKJAVIK)
   *         .build();
   * }
   *
   * <p>Builder instances can be reused; it is safe to call {@link #build} multiple times to build
   * multiple graphs in series. Each new graph contains all the elements of the ones created before
   * it.
   *
   * @since 28.0
   */
  public static class Builder<N, V> {

    private final MutableValueGraph<N, V> mutableValueGraph;