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Splitting 4 turn restrictions

I mapped this today Relation: 14409823 | OpenStreetMap - Coming from R-Street one must not turn left into A-Street via the node shared by both streets.

I was told, that I have to split way to at the via node, otherwise, the relation cannot be processed successfully. I see no reason for doing this: In my eyes, that via is an endpoint of from, is enough, to make the turn restriction unambiguous: any of no-*-turn and also only-*-turn at least. I rather not make gratuitous splits. Streets are already split so much.

I might be logically handicapped. So maybe I am missing something. My question therefore: Am I wrong, and splitting the To way necessary? If so, please explain, for whom, and why that is so.

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Ce sujet de discussion accompagne la publication sur https://community.openstreetmap.org/t/splitting-4-turn-restrictions/2047