stamen/modestmaps-js — comment on commit ceae90d923cbf29e87b64cf343c9164409bd258e
File:  line 0
By RandomEtc:

I also note that `roundZoom` won't preserve the old setExtent behavior. IIRC what `Math.ceil` was there for, `roundZoom` would want `Math.floor` instead (to make sure the requested extent is entirely within view).

But yeah, I'd prefer the non-rounded behavior to be optional. Granted, the `any` flag is awkward (and not as clear at the point of use) ... perhaps an alias e.g. `map.extent(...)` could default to the non-exact-zoom behaviour, complementing the polymaps style `.zoom` and `.center` as well?