For example, given:
db.posts = [ { id: '1', foo: 'bar' }, { id: '2', foo: 'baz'} ]
The following returns an empty array:
db.posts.where('id').is('1')
Whereas the following returns the first element in an array as expected:
db.posts.where('id').includes('1')
is() should work correctly for strings.
For example, given:
```js
db.posts = [ { id: '1', foo: 'bar' }, { id: '2', foo: 'baz'} ]
```
The following returns an empty array:
```js
db.posts.where('id').is('1')
```
Whereas the following returns the first element in an array as expected:
```js
db.posts.where('id').includes('1')
```
`is()` should work correctly for strings.