Hi everyone,

I need to have float weight on a graph as it is used as a pricing problem for column generation.

As far as i can see the dijkstra_shortest_paths should be able use float weight, but when i try the following:

```
g = MetaGraph(2,0)
add_edge!(g,1,2)
set_prop!(g,1,2,:weight,5.9)
dijkstra_shortest_paths(g,1)
```

I get an inexact error:

```
InexactError: Int64(5.9)
in top-level scope at graphs.jl:50
in dijkstra_shortest_paths at LightGraphs\HsNig\src\shortestpaths\dijkstra.jl:143
in dijkstra_shortest_paths at LightGraphs\HsNig\src\shortestpaths\dijkstra.jl:143
in #dijkstra_shortest_paths#106 at base\none
in #dijkstra_shortest_paths#105 at LightGraphs\HsNig\src\shortestpaths\dijkstra.jl:95
in getindex at MetaGraphs\V2aXW\src\MetaGraphs.jl:199
in Int64 at base\float.jl:709
```

I might be wrong but i shouldn’t the following part that fails be able to handle floats?:

```
function getindex(w::MetaWeights{T,U}, u::Integer, v::Integer)::U where T <: Integer where U <: Real
_e = Edge(u, v)
e = !w.directed && !LightGraphs.is_ordered(_e) ? reverse(_e) : _e
!haskey(w.eprops, e) && return w.defaultweight
return U(get(w.eprops[e], w.weightfield, w.defaultweight))
end
```

Is this a bug or should i fint another way to do what i need to do? If so, do anyone have suggestions what to use?