Fields converting Tensor variables to Arrays

[jvaara]

How to reproduce:

1. Update a value to integration point
   update!(ip, variable, time => value),
   where value <: AbstractTensor.
   typeof(value)
[ Info: Tensors.SymmetricTensor{2,3,Float64,6}

2. Check the realized type
   typeof(ip(variable, time))
[ Info: Array{Float64,2}

[ahojukka5]

julia> update!(element, 0.0 => data)
ERROR: MethodError: no method matching update!(::Element{Seg2}, ::Pair{Float64,Tensor{1,3,Int64,3}})

I cannot even update the field.