[Tagging] s oneway=yes applying only to vehicles? ) Or is it applying to traffic on main part of way?

[Mateusz Konieczny]

1) oneway=yes is typically used on roads
2) when oneway=yes is used on roads it applies to vehicles and does not apply
to pedestrians on sidewalks
3) when oneway=yes is used on roads it applies also to cyclists on carriageway
(unless overridden by oneway:bicycle=no)

Questions:
(1) is oneway=yes on road applying to cyclists travelling on sidewalks/cycleway=track?

(2) 
Is oneway=yes applying to pedestrians when used on ways where no vehicle traffic
is allowed?
For example is oneway=yes highway=footway oneway for pedestrians?

Is it correct to map oneway hiking trail as
highway=path + oneway=yes + foot=yes + bicycle=no + ski=no + snowmobile=no
?

(3) is oneway=yes used in meaning "applies to all vehicles" So would apply
on main road part, on sidewalks, on attached cycleways if mapped as property of road.
And highway=tertiary cycleway:both=track oneway=yes would mean
that attached cycleways are oneway in direction of way.

Or is it better defined as "applies to main part of the way"
So would apply to carriageway if used on road
And highway=tertiary cycleway:both=track oneway=yes would mean
that attached cycleways can be used in both directions.
So would apply to pedestrians if used on highway=footway

This concerns 
https://wiki.openstreetmap.org/wiki/Key:oneway:foot
https://wiki.openstreetmap.org/wiki/Key:oneway
where there is a quite prolonged disagreement how this should be tagged
and how it is being tagged.

Note that I am not asking how tagging scheme would be designed in the idea world
and I am not asking is OSM Wiki currently correct - I am asking about actual use.

Based on what I know highway=footway oneway=yes means that such way
is oneway for pedestrians and current OSM Wiki description is incorrectly
making claims about oneway:foot.

And such redefinition would not even be helpful.
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