What is the M.2 slot keying in the Librem 14? I have only managed to find the web page at https://puri.sm/faq/storage-options/ which says the slots accept B+M keyed cards. As far as I can tell, that could mean any of these keyings for the slot itself: B, M, B+M.
I have seen it specified elsewhere that the WiFi slot is M.2 E-keyed, but that is not relevant.
Also, can anyone tell me where to find a clear specification of the keying of the Samsung 980 PRO card? It is not on the Samsung data sheet or on the Samsung specifications on their web site(s).