Currently if `CollectionProxy` has more than one new record,
`CollectionProxy#uniq` result is incorrect.
And `CollectionProxy#uniq` was aliased to `distinct` in a1bb6c8.
But the `uniq` method and the `SELECT DISTINCT` method are different
methods. The doc in `CollectionProxy` is for the `SELECT DISTINCT`
method, not for the `uniq` method.
Therefore, reverting the alias in `CollectionProxy` to fix the
inconsistency and to have the both methods.
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