[Tile-serving] [openstreetmap/osm2pgsql] --expire-tiles: Parameter parsing does not work (#830)

[Michael Reichert]

Thank you for your bug report.

The bug described here is partially a bug and partially a missing piece of documentation.

The mentioned commit changed all zoom levels to `uint32_t`. `0` is now reserved for "invalid" zoom level (and `std::strtoul` returns 0 if no integer could be read). Having a tile expiry starting at zoom level `0` will always write `0/0/0` to the expiry list except if the diff to be imported was empty or contained only changes you are not interested in (defined by the style file and/or your Lua filters).

However, my code contained a real bug because it did not accept `-e 19`.

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