I've noticed a difference in output between 4.7.0 and 4.7.1-rc1. Although there are minor and (I think) inconsequential differences to how the turtle is formatted, the main thing I see is that string datatypes specified during ingest are stripped in the output of 4.7.1-rc1. As noted, I've seen this with xsd:string. I've tested xsd:dateTime and that outputs as expected. I've not tested any other datatypes.