How to read xdelta3 files with secondary compression enabled?

[zonque]

I'm not sure if I understand the code correctly, but the VCDiffStreamingDecoderImpl class bails out early if the delta file it sees has secondary compression such as lzma enabled. This, however, is the default when the vcdiff file was made with xdelta3. Worse yet, I can't seem to disable the secondary compression using the xdelta command line tool.

Is that a known issue?

[ehrmann]

I maintain a Java port of this code and got a similar question. Those are xdelta3 extensions, but the flags -S -n -A disable them.