Round tripping Quantities through String

Hi, thanks for the package, nice to have an alternative approach to the Unitful type-based one.

Is there a way in this package to convert back and fourth between Quantities and String representations so that quantities could be serialised to strings and parsed back again? Like in Unitful, `string(q::Quantity)` prints a space between the last numeral and the unit, which yields an error with `uparse`.