{"action":"created","comment":{"url":"https://api.github.com/repos/Microsoft/TypeScript/pulls/comments/43902258","id":43902258,"diff_hunk":"@@ -888,6 +888,10 @@\n         \"category\": \"Error\",\r\n         \"code\": 2322\r\n     },\r\n+    \"Type '{0}' is not comparable with type '{1}'.\": {\r","path":"src/compiler/diagnosticMessages.json","position":4,"original_position":4,"commit_id":"80a50aa104054df7846d244bfbc5ed1ecfa408ac","original_commit_id":"80a50aa104054df7846d244bfbc5ed1ecfa408ac","user":{"login":"sandersn","id":293473,"avatar_url":"https://avatars.githubusercontent.com/u/293473?v=3","gravatar_id":"","url":"https://api.github.com/users/sandersn","html_url":"https://github.com/sandersn","followers_url":"https://api.github.com/users/sandersn/followers","following_url":"https://api.github.com/users/sandersn/following{/other_user}","gists_url":"https://api.github.com/users/sandersn/gists{/gist_id}","starred_url":"https://api.github.com/users/sandersn/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sandersn/subscriptions","organizations_url":"https://api.github.com/users/sandersn/orgs","repos_url":"https://api.github.com/users/sandersn/repos","events_url":"https://api.github.com/users/sandersn/events{/privacy}","received_events_url":"https://api.github.com/users/sandersn/received_events","type":"User","site_admin":false},"body":"I prefer 'comparable to' here. A little research shows that grammarians think they're about equally common, while Google's hideously unreliable hit count shows 4 times more hits for 'comparable to'*.\r\n\r\nBut the function is also named `isTypeComparableTo`, so I think there's precedent. :)\r\n\r\n*Google hit counts are the laziest way to do quantitative linguistics.","created_at":"2015-11-04T16:26:56Z","updated_at":"2015-11-04T16:26:56Z","html_url":"https://github.com/Microsoft/TypeScript/pull/5517#discussion_r43902258","pull_request_url":"https://api.github.com/repos/Microsoft/TypeScript/pulls/5517","_links":{"self":{"href":"https://api.github.com/repos/Microsoft/TypeScript/pulls/comments/43902258"},"html":{"href":"https://github.com/Microsoft/TypeScript/pull/5517#discussion_r43902258"},"pull_request":{"href":"https://api.github.com/repos/Microsoft/TypeScript/pulls/5517"}}},"pull_request":{"url":"https://api.github.com/repos/Microsoft/TypeScript/pulls/5517","id":49638400,"html_url":"https://github.com/Microsoft/TypeScript/pull/5517","diff_url":"https://github.com/Microsoft/TypeScript/pull/5517.diff","patch_url":"https://github.com/Microsoft/TypeScript/pull/5517.patch","issue_url":"https://api.github.com/repos/Microsoft/TypeScript/issues/5517","number":5517,"state":"open","locked":false,"title":"Introduce the \"comparable\" relation","user":{"login":"DanielRosenwasser","id":972891,"avatar_url":"https://avatars.githubusercontent.com/u/972891?v=3","gravatar_id":"","url":"https://api.github.com/users/DanielRosenwasser","html_url":"https://github.com/DanielRosenwasser","followers_url":"https://api.github.com/users/DanielRosenwasser/followers","following_url":"https://api.github.com/users/DanielRosenwasser/following{/other_user}","gists_url":"https://api.github.com/users/DanielRosenwasser/gists{/gist_id}","starred_url":"https://api.github.com/users/DanielRosenwasser/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/DanielRosenwasser/subscriptions","organizations_url":"https://api.github.com/users/DanielRosenwasser/orgs","repos_url":"https://api.github.com/users/DanielRosenwasser/repos","events_url":"https://api.github.com/users/DanielRosenwasser/events{/privacy}","received_events_url":"https://api.github.com/users/DanielRosenwasser/received_events","type":"User","site_admin":false},"body":"This pull request introduces a new relationship to check whether or not two types are \"comparable to\" one another. Specifically, it addresses the issues found in #5300 with union types and certain operations.\r\n\r\nThe new relationship generally subsumes the uses for assignability where we would check whether or not two types were assignable to or assignable from one another. These uses were in checking for compatibility between\r\n\r\n* the types of the left and right sides of equality/inequality operators (`===`, `!==`, `==`, `!=`).\r\n* the types of `case` clause expressions and their respective `switch` expressions.\r\n* the type of an expression in a type assertion with the type being asserted.\r\n\r\nLike with other type relations, the comparable relation takes a *source* and a *target*. It is the most lenient relation, so types that are assignable are always comparable, but the reverse is not necessarily true. The comparable relation differs from the assignability relation in that if the *source* is a union type, the relation succeeds provided that each of its constituents are comparable to the 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