[Koha-devel] implementation of authorised values

Dear all, I'm wondering how occurrences of authorised values are represented in Koha's database. I'm aware of the authorised_values table, but that's not my concern here. Assume one decides to bind a Koha field to an authorised value. My question is: what will finally be stored in that field ? Will it be the primary key associated to the authorised value (id), or will it be the content of the authorised_value column ? In the latter case, if this value changes, how is it updated ? Thanks a lot for any help, Sébastien.