GlobalVisIsRemovableFullXid() vs GlobalVisCheckRemovableXid()

Why is GlobalVisIsRemovableFullXid() not named
GlobalVisCheckRemovableFullXid() instead? ISTM that that name makes
much more sense, since it is what I'd expect for a function that is
the "Full XID equivalent" of GlobalVisCheckRemovableXid().

Note also that GlobalVisIsRemovableFullXid() is the only symbol name
matching "GlobalVisIsRemovable*".

Have I missed something?

-- 
Peter Geoghegan