Support bivalent streams in generic-read-sequence.
Support bivalent streams in generic-read-sequence.

AugustusHuang/Mezzano,varjagg/Mezzano,AugustusHuang/Mezzano,rvedam/Mezzano,froggey/Mezzano,rvedam/Mezzano,froggey/Mezzano,varjagg/Mezzano