[web2py] contains() subtleties on GAE

[pepper_bg]

So on GAE this seems to be fine:

db(db.my_table.my_set.contains([1], all=False)).select()
while this:

db(db.my_table.my_set.contains([1,2], all=False)).select()

seems to always boil down to an OR somewhere deep bellow:
File "/base/data/home/apps/s~my_app/1.354557643063785927/gluon/
dal.py", line 3050, in OR
    def OR(self,first,second): raise SyntaxError, "Not supported"
SyntaxError: Not supported

my_set is a 'list:reference'

Is the best way to treat it this:

db(db.my_table.my_set.contains([1], all=False)).select() |
db(db.my_table.my_set.contains([2], all=False)).select()

or something else? Appreciate your help!