Sometimes you want a named tuple, but mutable. This works by wrapping
a named tuple where all the elements are mutable `Ref`

s and then
pretending that it’s elements are that contents of the `Ref`

s instead.

```
julia> using MutableNamedTuples
julia> mnt = MutableNamedTuple(a=1, b= 2)
MutableNamedTuple(a = 1, b = 2)
julia> mnt.a = 2
2
julia> mnt
MutableNamedTuple(a = 2, b = 2)
```

```
julia> const MNT = MutableNamedTuple
MutableNamedTuple
julia> A = [MNT(a = 1, b=2) MNT(a=3, b=6)
MNT(a =-1, b=4) MNT(a=1, b=1)]
2×2 Array{MutableNamedTuple{(:a, :b),Tuple{Base.RefValue{Int64},Base.RefValue{Int64}}},2}:
MutableNamedTuple(a = 1, b = 2) MutableNamedTuple(a = 3, b = 6)
MutableNamedTuple(a = -1, b = 4) MutableNamedTuple(a = 1, b = 1)
julia> A[1, 1].a = 100
100
julia> A
2×2 Array{MutableNamedTuple{(:a, :b),Tuple{Base.RefValue{Int64},Base.RefValue{Int64}}},2}:
MutableNamedTuple(a = 100, b = 2) MutableNamedTuple(a = 3, b = 6)
MutableNamedTuple(a = -1, b = 4) MutableNamedTuple(a = 1, b = 1)
```

You should probably use StructArrays.jl though.