Why is zoom an integer?

[zcorpan]

 interface HTMLMapElement : HTMLElement {
...
    readonly attribute unsigned short zoom;

Why is zoom an integer?

[prushforth]

That's a good question. I think mostly because tile servers only provide whole integer zoom levels, despite that the client can in theory have a non-integer zoom state, and indeed does have when you animate zoomTo and other map actions.

So maybe it should be a readonly double?