This is a new feature added in current dev version. There are multiple open issues related to it
DT()
All those issues should be fixed before rolling out this new function. Therefore to not slow down 1.14.4 1.15.0 I suggest to mark DT() as not exported for the current moment, and re-export it shortly after release (if there will be such demand, see #5621);, so users of our dev pkg can still use it.