Remove the grouping (subtables) of actualTableKeys
Remove the grouping (subtables) of actualTableKeys

I consider any possible speed gain to be negligible, and think
that better readability of the source should be favored over some
performance penalties. Having table-type keys is exotic enough in
itself, we shouldn't over-engineer this case?

GuntherStruyf/luaunit,GuntherStruyf/luaunit