{"action":"created","issue":{"url":"https://api.github.com/repos/akka/akka/issues/19141","labels_url":"https://api.github.com/repos/akka/akka/issues/19141/labels{/name}","comments_url":"https://api.github.com/repos/akka/akka/issues/19141/comments","events_url":"https://api.github.com/repos/akka/akka/issues/19141/events","html_url":"https://github.com/akka/akka/issues/19141","id":121450289,"number":19141,"title":"GraphStage / SourceStage consistency w.r.t. mat value","user":{"login":"ktoso","id":120979,"avatar_url":"https://avatars.githubusercontent.com/u/120979?v=3","gravatar_id":"","url":"https://api.github.com/users/ktoso","html_url":"https://github.com/ktoso","followers_url":"https://api.github.com/users/ktoso/followers","following_url":"https://api.github.com/users/ktoso/following{/other_user}","gists_url":"https://api.github.com/users/ktoso/gists{/gist_id}","starred_url":"https://api.github.com/users/ktoso/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ktoso/subscriptions","organizations_url":"https://api.github.com/users/ktoso/orgs","repos_url":"https://api.github.com/users/ktoso/repos","events_url":"https://api.github.com/users/ktoso/events{/privacy}","received_events_url":"https://api.github.com/users/ktoso/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/akka/akka/labels/1%20-%20triaged","name":"1 - triaged","color":"5319e7"},{"url":"https://api.github.com/repos/akka/akka/labels/t:stream","name":"t:stream","color":"cccccc"}],"state":"open","locked":false,"assignee":null,"milestone":{"url":"https://api.github.com/repos/akka/akka/milestones/16","html_url":"https://github.com/akka/akka/milestones/streams-2.0","labels_url":"https://api.github.com/repos/akka/akka/milestones/16/labels","id":745106,"number":16,"title":"streams-2.0","description":"","creator":{"login":"rkuhn","id":470469,"avatar_url":"https://avatars.githubusercontent.com/u/470469?v=3","gravatar_id":"","url":"https://api.github.com/users/rkuhn","html_url":"https://github.com/rkuhn","followers_url":"https://api.github.com/users/rkuhn/followers","following_url":"https://api.github.com/users/rkuhn/following{/other_user}","gists_url":"https://api.github.com/users/rkuhn/gists{/gist_id}","starred_url":"https://api.github.com/users/rkuhn/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/rkuhn/subscriptions","organizations_url":"https://api.github.com/users/rkuhn/orgs","repos_url":"https://api.github.com/users/rkuhn/repos","events_url":"https://api.github.com/users/rkuhn/events{/privacy}","received_events_url":"https://api.github.com/users/rkuhn/received_events","type":"User","site_admin":false},"open_issues":47,"closed_issues":3,"state":"open","created_at":"2014-08-06T15:08:47Z","updated_at":"2015-12-13T15:56:38Z","due_on":null,"closed_at":null},"comments":1,"created_at":"2015-12-10T10:19:14Z","updated_at":"2015-12-13T16:05:15Z","closed_at":null,"body":"They're not consistent in the sense of:\r\n\r\n- GraphStage - no mat value\r\n- GraphStageWithMaterializedValue - needs mat value\r\n- SourceStage / SinkStage / FlowStage - needs mat value\r\n\r\nShouldn't we have SourceStageWithMaterializedValue etc?"},"comment":{"url":"https://api.github.com/repos/akka/akka/issues/comments/164271053","html_url":"https://github.com/akka/akka/issues/19141#issuecomment-164271053","issue_url":"https://api.github.com/repos/akka/akka/issues/19141","id":164271053,"user":{"login":"hepin1989","id":501740,"avatar_url":"https://avatars.githubusercontent.com/u/501740?v=3","gravatar_id":"","url":"https://api.github.com/users/hepin1989","html_url":"https://github.com/hepin1989","followers_url":"https://api.github.com/users/hepin1989/followers","following_url":"https://api.github.com/users/hepin1989/following{/other_user}","gists_url":"https://api.github.com/users/hepin1989/gists{/gist_id}","starred_url":"https://api.github.com/users/hepin1989/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/hepin1989/subscriptions","organizations_url":"https://api.github.com/users/hepin1989/orgs","repos_url":"https://api.github.com/users/hepin1989/repos","events_url":"https://api.github.com/users/hepin1989/events{/privacy}","received_events_url":"https://api.github.com/users/hepin1989/received_events","type":"User","site_admin":false},"created_at":"2015-12-13T16:05:15Z","updated_at":"2015-12-13T16:05:15Z","body":"that's inconsistent makes wondering a while why the `GraphStage` extends `GraphStageWithMaterializedValue` when it don't have a `MaterializedValue`."}}