[Tagging] What does bicycle=no on a node means?

[Emvee]

Basic question I think, for a bicycle router bicycle=no on a node means 
it should "avoid" crossing the node likely by adding a moderate penalty 
as the cyclist could make the choice to dismount passing the node. I 
know at least on bicycle router implementing it this way, see 
https://github.com/abrensch/brouter/issues/265

Question now is if this rule should be applied differently if it is used 
in combination with highway=crossing.

The recent "meaning of highway=crossing + bicycle=no" thread makes the 
case that it means "you cannot use this crossing to cross road while 
cycling, it does not affect legality of cycling on the road"

I think this is a bad idea as that way the access can not be evaluated 
in node context (a router would have to look at the incoming and 
outgoing way) while adding bicycle=yes/no to a crossing node does not 
give "additional possibilities"; by giving the right access rights on 
the ways connecting to the node all possible access scenarios can be 
covered.

Started this new thread as I just subscribed to the tagging list and I 
think this title is more focusing on what is the point but please have a 
look at
"meaning of highway=crossing + bicycle=no" thread for the other side of 
the story, 
https://lists.openstreetmap.org/pipermail/tagging/2020-October/055611.html

Would be good to get some feedback from others as this has been a (too) 
long debate between only me and the of the author of the "meaning of 
highway=crossing + bicycle=no" thread, see 
https://wiki.openstreetmap.org/wiki/Talk:Tag:highway%3Dcrossing#highway.3Dcrossing_with_bicycle.3Dno