In AR depths use &:to_i before :uniq to process mixed arrays likes ["1", 1] correct

[avakhov]

Without fix my new test failed:

  1) Failure:
test_finding_using_sql_take_into_account_only_uniq_ids(HasManyAssociationsTest) [test/cases/associations/has_many_associations_test.rb:385]:
--- expected
+++ actual
@@ -1 +1 @@
-#<Client id: 3, type: "Client", ruby_type: "Client", firm_id: 1, firm_name: nil, name: "Microsoft", client_of: 1, rating: 1, account_id: nil>
+[#<Client id: 3, type: "Client", ruby_type: "Client", firm_id: 1, firm_name: nil, name: "Microsoft", client_of: 1, rating: 1, account_id: nil>]

This only one case then logic in condition collection_association.rb#L549-555 works not good. In other cases the method returned right results:

firm.clients_using_sql.find(1, "1", 2) # => [Client1, Client2] # <- that's correct

[josevalim]

I didn't know we assumed the fkey is an integer. But that is another discussion. Merging, thanks.