{"action":"closed","issue":{"url":"https://api.github.com/repos/zloirock/core-js/issues/150","labels_url":"https://api.github.com/repos/zloirock/core-js/issues/150/labels{/name}","comments_url":"https://api.github.com/repos/zloirock/core-js/issues/150/comments","events_url":"https://api.github.com/repos/zloirock/core-js/issues/150/events","html_url":"https://github.com/zloirock/core-js/issues/150","id":122614577,"number":150,"title":"Usage shortcuts of arguments object breaks old version of WebKit","user":{"login":"aaronjensen","id":8588,"avatar_url":"https://avatars.githubusercontent.com/u/8588?v=3","gravatar_id":"","url":"https://api.github.com/users/aaronjensen","html_url":"https://github.com/aaronjensen","followers_url":"https://api.github.com/users/aaronjensen/followers","following_url":"https://api.github.com/users/aaronjensen/following{/other_user}","gists_url":"https://api.github.com/users/aaronjensen/gists{/gist_id}","starred_url":"https://api.github.com/users/aaronjensen/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/aaronjensen/subscriptions","organizations_url":"https://api.github.com/users/aaronjensen/orgs","repos_url":"https://api.github.com/users/aaronjensen/repos","events_url":"https://api.github.com/users/aaronjensen/events{/privacy}","received_events_url":"https://api.github.com/users/aaronjensen/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/zloirock/core-js/labels/webkit","name":"webkit","color":"fad8c7"}],"state":"closed","locked":false,"assignee":null,"milestone":null,"comments":5,"created_at":"2015-12-16T22:08:17Z","updated_at":"2015-12-17T12:30:33Z","closed_at":"2015-12-17T12:30:33Z","body":"Ok, this is an odd one and is more likely a (fixed) webkit issue and not a core-js issue, but I wanted to point it out here in case you wanted to do something about it.\r\n\r\nThis change: https://github.com/zloirock/core-js/commit/5bcabcaf7f5425fc7a61610ae82685ef3aae0fce#diff-f68e573b7ecfc93a7afcce675b0459eaL24\r\n\r\nCauses this error: \r\n\r\n```\r\nTypeError: 'undefined' is not an object (evaluating '$$[index++]')\r\n```\r\n\r\nOn this stack in capybara-webkit:\r\n\r\n```\r\nLinux id16784 3.8.0-44-generic #66~precise1-Ubuntu SMP Tue Jul 15 04:01:04 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux\r\nCapybara: 2.5.0\r\ncapybara-webkit: 1.7.1\r\nQt: 5.0.2\r\nWebKit: 537.21\r\nQtWebKit: 5.1.1\r\n```\r\n\r\nBut it works fine on OS X with a newer version of Qt:\r\n\r\n```\r\nCapybara: 2.5.0\r\ncapybara-webkit: 1.7.1\r\nQt: 5.5.1\r\nWebKit: 538.1\r\nQtWebKit: 5.5.1\r\n```\r\n\r\n"}}