Conversion of Array{'type',1} to Type{'type'}

[IanButterworth]

Would it be a good idea if arrays of length 1 are convertible to their nested type? i.e. to avoid errors like:
'convert' has no method matching convert(::Type{Float64}, ::Array{Float64,1})

Perhaps it could be quite a nice shortcut?

i.e.

x = Array(Float64,10,10,10)
y = ones(Float64,10,10,10)

x[1,1,1] = mean(y[:,1,1],1)

[IanButterworth]

Should've searched harder first.. Related: #3262 #4270 #2591 #2686 #4797