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The test above only had it because it was in a hand-written Workflow. And, yeah, it’s (almost?) impossible to not have rewriteRefs called at least once, which will currently replace `Include` with a `DocField`.\r\n\r\nI would actually like to use `Include` instead of `DocField` whenever possible, but when I made the change to Reshape like `DocField(v) if k == v => Include`, it broke some stuff (finding sort keys for distinct?) so I decided it was too far-reaching to be part of this PR.","created_at":"2015-02-19T19:48:09Z","updated_at":"2015-02-19T19:48:09Z","html_url":"https://github.com/slamdata/slamengine/pull/623#discussion_r25018629","pull_request_url":"https://api.github.com/repos/slamdata/slamengine/pulls/623","_links":{"self":{"href":"https://api.github.com/repos/slamdata/slamengine/pulls/comments/25018629"},"html":{"href":"https://github.com/slamdata/slamengine/pull/623#discussion_r25018629"},"pull_request":{"href":"https://api.github.com/repos/slamdata/slamengine/pulls/623"}}},"pull_request":{"url":"https://api.github.com/repos/slamdata/slamengine/pulls/623","id":29559422,"html_url":"https://github.com/slamdata/slamengine/pull/623","diff_url":"https://github.com/slamdata/slamengine/pull/623.diff","patch_url":"https://github.com/slamdata/slamengine/pull/623.patch","issue_url":"https://api.github.com/repos/slamdata/slamengine/issues/623","number":623,"state":"open","locked":false,"title":"Project known shapes out of 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