@safe D requires which DIP switches?

Mon Jan 3 14:27:55 UTC 2022

As far as I know `@safe` is only really safe with both DIP25 and 
DIP1000 in effect, and I thought that DIP25 has been integrated 
for a while now. Nonetheless, DIP25 still appears in the list of 
previews (`dmd -preview=help`) *as well as* being revertible 
(`dmd -revert=help`) which adds to the confusion.

What is in the way of integrating DIP1000 by default?

-- Bastiaan.