mapbox/vector-tile-query — pull request #60 by dnomadb (2014-09-24 23:12:20+00:00)
Title: Async fill null values in query

Gonna punt on the full smoothing between stepped values / general response smoothing for right now - proving to be a relatively complex problem.
- `fill:false` in options does not 'fill nulls'
- `fill:true` in options fills null values either (a) interpolated between two points, or (b) extrapolated out from first/last non-null
- only "fills" number returns
- a query of all nulls will still return null