{"action":"created","issue":{"url":"https://api.github.com/repos/dotnet/corefx/issues/5146","labels_url":"https://api.github.com/repos/dotnet/corefx/issues/5146/labels{/name}","comments_url":"https://api.github.com/repos/dotnet/corefx/issues/5146/comments","events_url":"https://api.github.com/repos/dotnet/corefx/issues/5146/events","html_url":"https://github.com/dotnet/corefx/pull/5146","id":124286235,"number":5146,"title":"ObservableCollection<T>: Reuse immutable EventArgs objects","user":{"login":"justinvp","id":710598,"avatar_url":"https://avatars.githubusercontent.com/u/710598?v=3","gravatar_id":"","url":"https://api.github.com/users/justinvp","html_url":"https://github.com/justinvp","followers_url":"https://api.github.com/users/justinvp/followers","following_url":"https://api.github.com/users/justinvp/following{/other_user}","gists_url":"https://api.github.com/users/justinvp/gists{/gist_id}","starred_url":"https://api.github.com/users/justinvp/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/justinvp/subscriptions","organizations_url":"https://api.github.com/users/justinvp/orgs","repos_url":"https://api.github.com/users/justinvp/repos","events_url":"https://api.github.com/users/justinvp/events{/privacy}","received_events_url":"https://api.github.com/users/justinvp/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/dotnet/corefx/labels/cla-already-signed","name":"cla-already-signed","color":"009800"}],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":2,"created_at":"2015-12-30T00:24:51Z","updated_at":"2015-12-30T01:04:13Z","closed_at":null,"pull_request":{"url":"https://api.github.com/repos/dotnet/corefx/pulls/5146","html_url":"https://github.com/dotnet/corefx/pull/5146","diff_url":"https://github.com/dotnet/corefx/pull/5146.diff","patch_url":"https://github.com/dotnet/corefx/pull/5146.patch"},"body":"Instead of always allocating new instances of `PropertyChangedEventArgs` for the `Count` and `Indexer` properties, and `NotifyCollectionChangedEventArgs` for `NotifyCollectionChangedAction.Reset`, reuse cached instances."},"comment":{"url":"https://api.github.com/repos/dotnet/corefx/issues/comments/167912902","html_url":"https://github.com/dotnet/corefx/pull/5146#issuecomment-167912902","issue_url":"https://api.github.com/repos/dotnet/corefx/issues/5146","id":167912902,"user":{"login":"justinvp","id":710598,"avatar_url":"https://avatars.githubusercontent.com/u/710598?v=3","gravatar_id":"","url":"https://api.github.com/users/justinvp","html_url":"https://github.com/justinvp","followers_url":"https://api.github.com/users/justinvp/followers","following_url":"https://api.github.com/users/justinvp/following{/other_user}","gists_url":"https://api.github.com/users/justinvp/gists{/gist_id}","starred_url":"https://api.github.com/users/justinvp/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/justinvp/subscriptions","organizations_url":"https://api.github.com/users/justinvp/orgs","repos_url":"https://api.github.com/users/justinvp/repos","events_url":"https://api.github.com/users/justinvp/events{/privacy}","received_events_url":"https://api.github.com/users/justinvp/received_events","type":"User","site_admin":false},"created_at":"2015-12-30T01:04:13Z","updated_at":"2015-12-30T01:04:13Z","body":"> How likely is it that somebody might care about event arguments being unique?\r\n\r\nI considered it but couldn't find any evidence of anyone requiring the objects to be unique instances. Consider that `EventArgs.Empty` is preferred over `new EventArgs()` for events that don't have any args."}}