String representation of unitful types

General Usage
1 
julia> typeof(1.0u"kg/m^3") <: Number
true
julia> typeof(1.0u"kg/m^3")
Quantity{Float64, 𝐌  𝐋 ^-3, Unitful.FreeUnits{(kg, m^-3), 𝐌  𝐋 ^-3, nothing}}
julia> Quantity{Float64, 𝐌  𝐋 ^-3, Unitful.FreeUnits{(kg, m^-3), 𝐌  𝐋 ^-3, nothing}} <: Number
ERROR: syntax: missing comma or } in argument list

How can I get a string representation of a unitful type in a such way that it can be parsed back by Julia? For other types it was as simple as string(Symbol(T))

2

Fyi, your question seems to be related to this open Unitful.jl issue.

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