This enhancement is small -- around 5KB. The preamble accurately documents the changes the enhancement makes. 
I ran SLint on the classes affected by this enhancement: ChangeList, GZipReadStream and  ReadStream.  SLint didn't report any problems for this enhancement.

I confirmed that after installing this changeset in a fresh 3.6alpha image, I could successfully browse, view decompressed, filein and/or install a gzipped-changeset. ( That's all the testing I did, though. )