PR is to remove datatable key after joining with joyn().
--> when executing a joyn::joyn, similarly to collapse, if sort = TRUE, the dt is sorted, if sort = FALSE, the dt is not sorted. In both cases, the resulting dt will never have a key by default so that it is up to the user to set it themselves.
joyn(). --> when executing a joyn::joyn, similarly to collapse, ifsort = TRUE, the dt is sorted, ifsort = FALSE, the dt is not sorted. In both cases, the resulting dt will never have a key by default so that it is up to the user to set it themselves.