This will fail to even pass just testAppendAndGetAllInts. Im pretty sure it applies to any situation in which we exactly fill up the rle buffer with 0s and then try to add another value that will also use rle. Pretty sure its because we assume 0 as a base but then if the user also adds 0 we get doubled. A simple bugfix would be to never start rle if we haven't at least written one s8b word to buffer. May not be best solution though!