Add support for the still pending encoding.ScalarMarshaler and
encoding.ScalarUnmarshaler interfaces, approved in golang/go#56235.
This patch deprecates geo.Point.MarshalUint64 in favour of
geo.Point.MarshalScalar and also adds an inline directive for go fix.
The same applies for the UnmarshalUint64 and UnmarshalScalar methods.
Updates #16583
Signed-off-by: Simon Law <sfllaw@tailscale.com>
Simon LawandGitHub
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