I agree with my fellow Westerner on the tusk tenons. There are some online examples – e.g. moravian workbench – you could search for to look at. One drawback of these for a bed is the possible “ouch factor” for shins with the protruding tenons. Also tricky if the headboard needs to be flush to the wall.
There are historical hardware solutions – look for bed bolts – that are in common use & don’t have the drawback of a projection past the bedpost. Lee Valley is one provider of a specialized bedbolt that does not require a hole all the way through the bedpost.
Hope this helps!
(Hi Peter – I’m an ex-pat in Upper Canada now but grew up in Regina.)