[Tagging] lunch_specials or lunch:specials ?

[Thilo Haug OSM]

Hello all,

I stumbled on a bakery which serves warm meals for lunch
which is quite unusual (whereas it's common for butchers in Germany)
http://www.schmidbeck.de/aktuelles.html

There are currently 5 occurrences of lunch_specials on taginfo :
https://taginfo.openstreetmap.org/search?q=lunch_specials

I think it would be better to use the namespace of Key:lunch instead :
https://wiki.openstreetmap.org/wiki/Key:lunch

Now for the description of the tag :
To me, the "lunch special" is a warm meal
for a reduced price that might be offered by a
butcher
restaurant
cafe
pub
bar
biergarten
and others

Usually, there's just a reduced choice
compared to "a la carte" (1-3 meals),
but it's available immediately (similar to fast food).
Not necessarily for takeaway, but there are already tags to indicate if
this applies.

Any additional comments ?

Cheers,
Thilo