What is the correct key to add to make a historical border?

Using boundary=historical doesn't say anything of the type of border, so I'm 
thinking of just adding historical=yes on a border (and corresponding 
relation). I noticed the historic=* key, but that seemed mainly aimed for 
historic sites and ruins, so I don't know if historic=yes is better since 
historic=* is already in use, or if the purpose is too different,

Just giving it a quick thought historical=yes feels best. Opinions?

Also, are there any appropriate keys for showing when the border was valid/in 
use?

Konrad

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