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Given a document named `Foo` with an array field named `bar`, a search like this fails:

```
Foo.and( [ { bar:

{ '$in': ['a', 'b', 'c'] }

}, { bar:

{ '$in': ['d', 'e', 'f'] }

} ])
```

With the following error:

> undefined method `start_with?' for :$in:Symbol

The operation that does this should be converting the symbol to a string before performing a `starts_with?` check on it.

The only workaround is to use the old arrow syntax instead to allow the keys to still be stringified:

```
Foo.and( [ { 'bar' =>

{ '$in' => ['a', 'b', 'c'] }

}, { 'bar' =>

{ '$in' => ['d', 'e', 'f'] }

} ])
```

causes

MONGOID-5054 $eq or $regex must be used in place of implicit equality based on value type

is duplicated by

MONGOID-5061 and() criterion does not work with operators as Ruby symbols

is related to

MONGOID-5023 Expand all conditions in a single argument together in `where` path

links to