CircleMarker class is not a Marker

[martinRenou]

Hi,

The CircleMarker class is not a subclass of Marker, so an instance of CircleMarker cannot be added to a MarkerCluster.

[martinRenou]

Maybe it's not a bug, in leaflet, the CircleMarker class inherits from Path class, not from Marker:
https://github.com/Leaflet/Leaflet/blob/master/src/layer/vector/CircleMarker.js

[SylvainCorlay]

This could probably be reported upstream. It looks like an inconsistency.

[SylvainCorlay]

Linking to issue Leaflet/Leaflet#6130