[Tile-serving] [openstreetmap/osm2pgsql] z_order values differing between default lua file and C code? (#913)

[Lucas Verney]

Hi,

When looking on the web at details on the way `z_order` values are computed in osm2pgsql, one often find references to the [default lua script](https://github.com/openstreetmap/osm2pgsql/blob/master/style.lua#L106-L118) (see for instance [this StackExchange answer](https://gis.stackexchange.com/a/296785)).

However, out of the box, osm2pgsql is doing tag transform with [this C code](https://github.com/openstreetmap/osm2pgsql/blob/ed0bf5b515936ec09c7b39d01223db319239aadb/tagtransform-c.cpp#L17-L32), and not this lua file.

I would have expected the LUA code to have the same results as the C code. Is there any reason for these to be out of sync?

Thanks!
Best,

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