Problem with non-numeric authorised value

[MagnusEnger]

Kia ora!

I had a site where one of the NOT_LOAN authorised values had gotten a non-numeric authorised_value, like so:

MariaDB [koha_koha]> select * from authorised_values where category = 'NOT_LOAN';
+-----+----------+------------------+--------------------+--------------------+----------+
| id  | category | authorised_value | lib                | lib_opac           | imageurl |
+-----+----------+------------------+--------------------+--------------------+----------+
|  29 | NOT_LOAN | -1               | Beställd           | NULL               |          |
| 430 | NOT_LOAN | -2               | Läsesalslån        | Läsesalslån        |          |
|  30 | NOT_LOAN | 1                | Ej för utlån       | Ej för utlån       |          |
| 431 | NOT_LOAN | FJARR            | Fjärrlån           | Fjärrlån           |          |
+-----+----------+------------------+--------------------+--------------------+----------+

This resulted in /loan-status?libris_bibid=x? returning

<Status>Fjärrlån</Status>

for all items that were not on loan. Changing FJARR to a numeric value made the API return the expected Status = Tillgänglig.

Not sure this is something that deserves to be coded around, just wanted to record it as a clue if anyone runs into this in the future.