{"action":"opened","issue":{"url":"https://api.github.com/repos/jonascarpay/apecs/issues/9","repository_url":"https://api.github.com/repos/jonascarpay/apecs","labels_url":"https://api.github.com/repos/jonascarpay/apecs/issues/9/labels{/name}","comments_url":"https://api.github.com/repos/jonascarpay/apecs/issues/9/comments","events_url":"https://api.github.com/repos/jonascarpay/apecs/issues/9/events","html_url":"https://github.com/jonascarpay/apecs/issues/9","id":269277874,"number":9,"title":"SystemT performance","user":{"login":"jonascarpay","id":3593851,"avatar_url":"https://avatars2.githubusercontent.com/u/3593851?v=4","gravatar_id":"","url":"https://api.github.com/users/jonascarpay","html_url":"https://github.com/jonascarpay","followers_url":"https://api.github.com/users/jonascarpay/followers","following_url":"https://api.github.com/users/jonascarpay/following{/other_user}","gists_url":"https://api.github.com/users/jonascarpay/gists{/gist_id}","starred_url":"https://api.github.com/users/jonascarpay/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jonascarpay/subscriptions","organizations_url":"https://api.github.com/users/jonascarpay/orgs","repos_url":"https://api.github.com/users/jonascarpay/repos","events_url":"https://api.github.com/users/jonascarpay/events{/privacy}","received_events_url":"https://api.github.com/users/jonascarpay/received_events","type":"User","site_admin":false},"labels":[{"id":666076965,"url":"https://api.github.com/repos/jonascarpay/apecs/labels/help%20wanted","name":"help wanted","color":"128A0C","default":true}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2017-10-28T02:46:47Z","updated_at":"2017-10-28T02:46:47Z","closed_at":null,"author_association":"OWNER","body":"I really want to merge the SystemT branch, there are a lot of neat things it allows for. Unfortunately, there is a performance hit that needs to be addressed first.\r\n\r\nChanges:\r\n\r\n- `System w a = SystemT w IO a`, and `SystemT w m a = ReaderT w m a`\r\n- `Store s` is now `Store m s`, with e.g. `explGet s -> Int -> Stores s -> m ()`. `Store` instances have been changed to instances of `Store IO`.\r\n- `Has` and `Log` have a similar new `m` argument.\r\n\r\nThe actual, non-type signature code is mostly intact, which suggests that the cause is type-related."}}
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