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Fix an error when creating an empty index (after load([])). #225

• ⚡ Drastically reduce memory footprint (by up to 60%) and improve clustering performance by ~15-20%. #223
• ⚠️ Breaking: drop CommonJS entry point and switch to ESM only for Node & bundlers + UMD bundle for browsers.
• ⚠️ Breaking: drop support for IE11 (you can still transpile on your end to keep it).
• Upgrade kdbush dependency to v4.

Fix handling of non-integer zoom values in methods like getClusters(). #199

Avoid creating new objects for same clusters across zooms, improving memory footprint and making sure the same clusters have the same cluster_id across zoom levels. #190

Fix a bug where coordinates of unclustered points were snapping to a grid on higher zoom levels. #176

Fix fround fallback on IE11 so that the v7.1.1 small radius bugfix is effective there too.

Fix a bug where identical points sometimes wouldn't cluster on higher zooms given a small radius.

Added minPoints option for the minimum number of points to form a cluster (2 by default).

• Added generateId option to generate numeric ids (feature.id) for input features that don't have it.
• ⚠️ Possibly breaking: adjusted generated cluster id values to make sure there are no collisions when combined with generateId.

Slightly improved performance of map/reduce by avoiding redundant map calls. #131