Context:

Using tippecanoe@1.31.0 and tippecanoe@1.32.9, I ran < geo_stats.geojson tippecanoe -z10 -fo /tmp/stats.mbtiles where geo_stats.geojson contains features with tippecanoe.minzoom: 0.

Expected Behavior

Should have been processed without error, as it did in tippecanoe@1.27.9.

Actual behavior

Raises:

For layer 0, using name "stats"
standard input: Expected integer zoom level in "tippecanoe" GeoJSON extension, not 0
events.js:183
      throw er; // Unhandled 'error' event
      ^

My best guess

#604 introduced an isnormal check on zoom levels specified in the tippecanoe GeoJSON extension. According to the the C++ docs, however, isnormal(0) evaluates to false. Is it possible that isfinite is the test we're looking for, here?