{"action":"opened","issue":{"url":"https://api.github.com/repos/epatters/Catlab/issues/21","repository_url":"https://api.github.com/repos/epatters/Catlab","labels_url":"https://api.github.com/repos/epatters/Catlab/issues/21/labels{/name}","comments_url":"https://api.github.com/repos/epatters/Catlab/issues/21/comments","events_url":"https://api.github.com/repos/epatters/Catlab/issues/21/events","html_url":"https://github.com/epatters/Catlab/issues/21","id":372801920,"node_id":"MDU6SXNzdWUzNzI4MDE5MjA=","number":21,"title":"Move from Nullable{T} to Union{T,Nothing}","user":{"login":"epatters","id":316610,"node_id":"MDQ6VXNlcjMxNjYxMA==","avatar_url":"https://avatars3.githubusercontent.com/u/316610?v=4","gravatar_id":"","url":"https://api.github.com/users/epatters","html_url":"https://github.com/epatters","followers_url":"https://api.github.com/users/epatters/followers","following_url":"https://api.github.com/users/epatters/following{/other_user}","gists_url":"https://api.github.com/users/epatters/gists{/gist_id}","starred_url":"https://api.github.com/users/epatters/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/epatters/subscriptions","organizations_url":"https://api.github.com/users/epatters/orgs","repos_url":"https://api.github.com/users/epatters/repos","events_url":"https://api.github.com/users/epatters/events{/privacy}","received_events_url":"https://api.github.com/users/epatters/received_events","type":"User","site_admin":false},"labels":[{"id":1099233089,"node_id":"MDU6TGFiZWwxMDk5MjMzMDg5","url":"https://api.github.com/repos/epatters/Catlab/labels/cleanup","name":"cleanup","color":"f9d0c4","default":false}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2018-10-23T04:20:13Z","updated_at":"2018-10-23T04:20:13Z","closed_at":null,"author_association":"OWNER","body":"Since Julia v0.7, the `Nullable{T}` type has been moved from base Julia to an external package, in favor of writing `Union{T,Nothing}`.\r\n\r\nUnfortunately, the more pleasant syntax `T?` for such \"maybe types\" has not yet arrived (see https://github.com/JuliaLang/julia/issues/22682). When it does, we should migrate from Nullables to maybe types."}}
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