OBC gives an original version with some rather strange harmonies, and a modern (1922) alternative. However, according to the New Oxford Book of Carols (which I don't have to hand at the moment so this is AFAIR), the real original source was lost in a fire, and all the compilers of OBC - or anyone else - had to go on was a "horrendously inaccurate" print made in about 1840. Which sounds like a good excuse to make any revisions you like, they'll have just as good a claim of fidelity to the true original.
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