{"action":"created","issue":{"url":"https://api.github.com/repos/louthy/language-ext/issues/535","repository_url":"https://api.github.com/repos/louthy/language-ext","labels_url":"https://api.github.com/repos/louthy/language-ext/issues/535/labels{/name}","comments_url":"https://api.github.com/repos/louthy/language-ext/issues/535/comments","events_url":"https://api.github.com/repos/louthy/language-ext/issues/535/events","html_url":"https://github.com/louthy/language-ext/issues/535","id":391763621,"node_id":"MDU6SXNzdWUzOTE3NjM2MjE=","number":535,"title":"parse family of methods are not pure","user":{"login":"bender2k14","id":34664007,"node_id":"MDQ6VXNlcjM0NjY0MDA3","avatar_url":"https://avatars1.githubusercontent.com/u/34664007?v=4","gravatar_id":"","url":"https://api.github.com/users/bender2k14","html_url":"https://github.com/bender2k14","followers_url":"https://api.github.com/users/bender2k14/followers","following_url":"https://api.github.com/users/bender2k14/following{/other_user}","gists_url":"https://api.github.com/users/bender2k14/gists{/gist_id}","starred_url":"https://api.github.com/users/bender2k14/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bender2k14/subscriptions","organizations_url":"https://api.github.com/users/bender2k14/orgs","repos_url":"https://api.github.com/users/bender2k14/repos","events_url":"https://api.github.com/users/bender2k14/events{/privacy}","received_events_url":"https://api.github.com/users/bender2k14/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":1,"created_at":"2018-12-17T15:29:32Z","updated_at":"2019-02-09T15:28:56Z","closed_at":null,"author_association":"CONTRIBUTOR","body":"All the parse methods in [Prelude_Parse.cs](https://github.com/louthy/language-ext/blob/b81f45ce7ab358e707e16785c193aed6ebbc5a95/LanguageExt.Core/Prelude/Prelude_Parse.cs) (such as `parseInt` and `parseBool`) have the `Pure` attribute on them.\r\n\r\nHowever, some are not pure.  As I was just reading in [this blog post](https://www.dotnetcurry.com/csharp/1464/pure-code-csharp), the behavior of some of those standard library parse calls depends on global formatting state.\r\n\r\nAs a side note, what do people use the `Pure` attribute for?  We used to use it along with [Microsoft's code contracts](https://docs.microsoft.com/en-us/dotnet/framework/debug-trace-profile/code-contracts), but we don't do that any more."},"comment":{"url":"https://api.github.com/repos/louthy/language-ext/issues/comments/462053535","html_url":"https://github.com/louthy/language-ext/issues/535#issuecomment-462053535","issue_url":"https://api.github.com/repos/louthy/language-ext/issues/535","id":462053535,"node_id":"MDEyOklzc3VlQ29tbWVudDQ2MjA1MzUzNQ==","user":{"login":"bender2k14","id":34664007,"node_id":"MDQ6VXNlcjM0NjY0MDA3","avatar_url":"https://avatars1.githubusercontent.com/u/34664007?v=4","gravatar_id":"","url":"https://api.github.com/users/bender2k14","html_url":"https://github.com/bender2k14","followers_url":"https://api.github.com/users/bender2k14/followers","following_url":"https://api.github.com/users/bender2k14/following{/other_user}","gists_url":"https://api.github.com/users/bender2k14/gists{/gist_id}","starred_url":"https://api.github.com/users/bender2k14/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bender2k14/subscriptions","organizations_url":"https://api.github.com/users/bender2k14/orgs","repos_url":"https://api.github.com/users/bender2k14/repos","events_url":"https://api.github.com/users/bender2k14/events{/privacy}","received_events_url":"https://api.github.com/users/bender2k14/received_events","type":"User","site_admin":false},"created_at":"2019-02-09T15:28:56Z","updated_at":"2019-02-09T15:28:56Z","author_association":"CONTRIBUTOR","body":"I don't see the value using the `Pure` attribute, so I am indifferent about removing it."}}
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