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Most map tile providers use 256px square tiles so Leaflet's basic zoom algorithm looks like this:
256 * Math.pow(2, zoom);
If you're working with vector layers you can extend one of leaflet's default CRSs
and make it return tile sizes in smaller increments. This can be very helpful when using
fitBounds() with layer groups, so the zoomed group fits better within the map bounds:
E.g., extending L.CRS.EPSG3857 (the default CRS):