* Scale the tile size limit up with the multiplier at low zooms
* Add a test to demonstrate that high zoom tiles can't be extra large
* Update changelog and version
* Fail more cleanly when a tile can't be made small enough
* Guard against a cluster where the start marker has been dropped
* Look harder for a working feature interval instead of giving up
* That change to the drop-smallest logic changed a test output
* Update changelog
* Add explanatory comment