Gridded(Constant{Previous}()) returns wrong results

[nielsls]

To be fair, the docs for Constant does mention possibility of numerical errors but this seems quite wrong...

# wrong - should be 20
julia> interpolate(([1,2],),[10,20],Gridded(Constant{Previous}()))(2)
10

# correct
julia> interpolate([10,20],BSpline(Constant{Previous}()))(2)
20.0

[mkitti]

Thanks. I'll take a look.