{"action":"created","issue":{"url":"https://api.github.com/repos/gonum/diff/issues/21","repository_url":"https://api.github.com/repos/gonum/diff","labels_url":"https://api.github.com/repos/gonum/diff/issues/21/labels{/name}","comments_url":"https://api.github.com/repos/gonum/diff/issues/21/comments","events_url":"https://api.github.com/repos/gonum/diff/issues/21/events","html_url":"https://github.com/gonum/diff/pull/21","id":141443983,"number":21,"title":"API changes","user":{"login":"vladimir-ch","id":1837502,"avatar_url":"https://avatars.githubusercontent.com/u/1837502?v=3","gravatar_id":"","url":"https://api.github.com/users/vladimir-ch","html_url":"https://github.com/vladimir-ch","followers_url":"https://api.github.com/users/vladimir-ch/followers","following_url":"https://api.github.com/users/vladimir-ch/following{/other_user}","gists_url":"https://api.github.com/users/vladimir-ch/gists{/gist_id}","starred_url":"https://api.github.com/users/vladimir-ch/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/vladimir-ch/subscriptions","organizations_url":"https://api.github.com/users/vladimir-ch/orgs","repos_url":"https://api.github.com/users/vladimir-ch/repos","events_url":"https://api.github.com/users/vladimir-ch/events{/privacy}","received_events_url":"https://api.github.com/users/vladimir-ch/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":4,"created_at":"2016-03-17T00:56:46Z","updated_at":"2016-03-17T06:09:54Z","closed_at":null,"pull_request":{"url":"https://api.github.com/repos/gonum/diff/pulls/21","html_url":"https://github.com/gonum/diff/pull/21","diff_url":"https://github.com/gonum/diff/pull/21.diff","patch_url":"https://github.com/gonum/diff/pull/21.patch"},"body":""},"comment":{"url":"https://api.github.com/repos/gonum/diff/issues/comments/197722939","html_url":"https://github.com/gonum/diff/pull/21#issuecomment-197722939","issue_url":"https://api.github.com/repos/gonum/diff/issues/21","id":197722939,"user":{"login":"vladimir-ch","id":1837502,"avatar_url":"https://avatars.githubusercontent.com/u/1837502?v=3","gravatar_id":"","url":"https://api.github.com/users/vladimir-ch","html_url":"https://github.com/vladimir-ch","followers_url":"https://api.github.com/users/vladimir-ch/followers","following_url":"https://api.github.com/users/vladimir-ch/following{/other_user}","gists_url":"https://api.github.com/users/vladimir-ch/gists{/gist_id}","starred_url":"https://api.github.com/users/vladimir-ch/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/vladimir-ch/subscriptions","organizations_url":"https://api.github.com/users/vladimir-ch/orgs","repos_url":"https://api.github.com/users/vladimir-ch/repos","events_url":"https://api.github.com/users/vladimir-ch/events{/privacy}","received_events_url":"https://api.github.com/users/vladimir-ch/received_events","type":"User","site_admin":false},"created_at":"2016-03-17T06:09:54Z","updated_at":"2016-03-17T06:09:54Z","body":"I personally would welcome simplifying the concurrency to a `bool`. Just as you say, I don't know what values other than 0 or MAX I should want to choose. At a coarser scale I can imagine caring but probably not at the low level of approximating the derivatives (or the quadrature). Furthermore, it would free us from obeying exact values, for example in situations like in `Derivative`.\r\n\r\nPTAL"}}