Github user srowen commented on a diff in the pull request:
    --- Diff: 
    @@ -47,13 +47,20 @@ public static int roundNumberOfBytesToNearestWord(int 
numBytes) {
       public static boolean arrayEquals(
           Object leftBase, long leftOffset, Object rightBase, long 
rightOffset, final long length) {
         int i = 0;
    -    while (i <= length - 8) {
    -      if (Platform.getLong(leftBase, leftOffset + i) !=
    -        Platform.getLong(rightBase, rightOffset + i)) {
    -        return false;
    -      }
    -      i += 8;
    -    }
    +      // This attempts to speed up the memcmp type of operation, but there 
is no way
    +      // to guarantee that the offsets will be on a word boundary in order 
to use
    +      // Platform.getLong
    --- End diff --
    No matter what, can't we modify this loop to still copy the portions of the 
region that do begin on a boundary? You can copy 8 bytes at a time for most of 
the region and bytes at a time at the start and end.

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