If a collection is created with a default write concern:
coll := db.Collection("collName", options.Collection().SetWriteConcern(writeconcern.New())),
write operations on the collection send serialize an empty write concern but should not.
If a collection is created with a default write concern:
coll := db.Collection("collName", options.Collection().SetWriteConcern(writeconcern.New())),
write operations on the collection send serialize an empty write concern but should not.