{"action":"created","comment":{"url":"https://api.github.com/repos/Microsoft/TypeScript/pulls/comments/43453540","id":43453540,"diff_hunk":"@@ -5603,18 +5603,29 @@ namespace ts {\n             return compareTypes(getTypeOfSymbol(sourceProp), getTypeOfSymbol(targetProp));\r\n         }\r\n \r\n+        // A source signature matches a target signature if the two signatures have the same number of required,\r\n+        // optional, and rest parameters.\r\n+        function isMatchingSignature(source: Signature, target: Signature) {\r\n+            return source.parameters.length === target.parameters.length &&\r\n+                source.minArgumentCount === target.minArgumentCount &&\r\n+                source.hasRestParameter === target.hasRestParameter;\r\n+        }\r\n+\r\n+        // A source signature partially matches a target signature if the target signature has no fewer required\r\n+        // parameters and no more overall parameters than the source signature (where a signature with a rest\r\n+        // parameter is always considered to have more overall parameters than one without).\r\n+        function isPartiallyMatchingSignature(source: Signature, target: Signature) {\r","path":"src/compiler/checker.ts","position":15,"original_position":15,"commit_id":"a27ed01516873d2ac0c70b32135eddf30461eba7","original_commit_id":"a27ed01516873d2ac0c70b32135eddf30461eba7","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":"Since it's already ambiguous what \"partially\" means, why don't you make `partial` a parameter of 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