[Tile-serving] [openstreetmap/osm2pgsql] Support for TWKB output (#1085)

[Jochen Topf]

Unfortunately you can not use `ST_AsTWKB()` with osm2pgsql, because we are using `COPY` to import the data which doesn't allow putting a function in there. You could do something with a trigger though. If PostGIS would simply allow "magic" conversion of the normal `geometry` type to `twkb` it would simply work. I don't see any reason why that wouldn't be possible but PostGIS doesn't allow it.

Yes, the geometry classes in osm2pgsql use double precision floating point values for the coordinates. That's what you have to work with.

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