- [ ] I'm reporting a bug, not asking for help
- [ ] I'm sure this is a Leaflet.MarkerCluster code issue, not an issue with my own code nor with the framework I'm using (Cordova, Ionic, Angular, React…)
- [ ] I've searched through the issues to make sure it's not yet reported

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## How to reproduce

- Leaflet version I'm using:
- Leaflet.MarkerCluster version I'm using:
- Browser (with version) I'm using:
- OS/Platform (with version) I'm using:
- step 1
- step 2

## What behaviour I'm expecting and which behaviour I'm seeing

## Minimal example reproducing the issue

- [ ] this example is as simple as possible
- [ ] this example does not rely on any third party code

Using http://leafletjs.com/edit.html or any other jsfiddle-like site.
