$addToSet not behaving as it should

[dor-benatia]

Hi , iv'e stumbled across a weird problem with mongo $addToSet in patch function,

i am running this code :

service.create({
'test':'1,
'links':['a','b']
})

after that i am doing : super.patch(null,{ '$addToSet': { links: [ 'test1', 'test2', 'test3' ] }}, { 'test':1 });
when looking at the object in the db i see links: ['a','b',test1', 'test2', 'test3' ] which correspond to $addToSet with $each operator as explained in these docs: https://docs.mongodb.com/manual/reference/operator/update/addToSet/#value-to-add-is-an-array

which should of added this array as single element.

what am I missing?

feathers-mongoose version: 8.5.1
mongo 4.2.3