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Some clients, such as Visual Studio Code, may open / close buffers
aggressively when working, this creates some extra load as we don't
cache document creation.
This PR does cache it. In general this has a very low footprint on
memory by itself, as the root state is shared across all buffers, but
of course, the documents themselves could be a big load, but that's
already the case so we don't make things worse.
Fixes #363
[Test suite passes ;)]