Add option to retrieve the unit as text

[JorundMartinsen]

Hello. I'm using this extension on a daily basis, but I've not found documentation or examples on this use case

When retrieving a unit from the database, I want the text part of unit in another column.
I could use space separation, but that seems inefficient and prone to error.

Any suggestions are appreciated

Desired result, function used as a placeholder

SELECT 
  tonne(value) as value,
  get_unit_text(tonne(value)) as unit
FROM value_double 
LIMIT 10;

         value         |    unit    
-----------------------+----------
 13.599363666572335 Mg |     Mg
 6.812643569443901 Mg  |     Mg
 0 kg                  |     kg
 3.651819394991275 Tg  |     Tg
 15.79587709758574 Tg  |     Tg
 822.3106735537558 kg  |     kg
 41.65109425967615 Mg  |     Mg
 5.6431896649999995 Pg |     Pg
 822.3106735537558 kg  |     kg
 5.6431896649999995 Pg |     Pg