Serialize subject and predicate literals correctly #330
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Closes #329
This does have as disadvantage that invalid turtle will be generated if quads get added to the writer that can not be represented in turtle. If that is a problem, an alternative solution would be to have variants of the writer, similarly to how n-quads get handled, where the turtle version throws an error if it encounters a literal in the subject/predicate position and the N3 version handles it correctly. Let me know what you prefer and I can update the PR.