The trait's contents aren't implemented yet.
"mesa" is supposed to mean the opposite of "meta". By "mesadata" I don't
mean mere content or payload: I mean data that is stored *inside* or
*under* such content or payload.
I found this meaning of "mesa" -- as opposite of "meta" -- by browsing
somewhere on the internet. Fair chance many classicists would think
poorly of this usage. But I don't care about etymology: I just need a
word to close a lexical gap.