{"action":"created","issue":{"url":"https://api.github.com/repos/mapbox/carto/issues/443","repository_url":"https://api.github.com/repos/mapbox/carto","labels_url":"https://api.github.com/repos/mapbox/carto/issues/443/labels{/name}","comments_url":"https://api.github.com/repos/mapbox/carto/issues/443/comments","events_url":"https://api.github.com/repos/mapbox/carto/issues/443/events","html_url":"https://github.com/mapbox/carto/issues/443","id":151192353,"number":443,"title":"v0.16.x regression in color math","user":{"login":"springmeyer","id":20300,"avatar_url":"https://avatars.githubusercontent.com/u/20300?v=3","gravatar_id":"","url":"https://api.github.com/users/springmeyer","html_url":"https://github.com/springmeyer","followers_url":"https://api.github.com/users/springmeyer/followers","following_url":"https://api.github.com/users/springmeyer/following{/other_user}","gists_url":"https://api.github.com/users/springmeyer/gists{/gist_id}","starred_url":"https://api.github.com/users/springmeyer/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/springmeyer/subscriptions","organizations_url":"https://api.github.com/users/springmeyer/orgs","repos_url":"https://api.github.com/users/springmeyer/repos","events_url":"https://api.github.com/users/springmeyer/events{/privacy}","received_events_url":"https://api.github.com/users/springmeyer/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/mapbox/carto/labels/bug","name":"bug","color":"e10c02"},{"url":"https://api.github.com/repos/mapbox/carto/labels/regression","name":"regression","color":"f7c6c7"}],"state":"closed","locked":false,"assignee":null,"milestone":{"url":"https://api.github.com/repos/mapbox/carto/milestones/9","html_url":"https://github.com/mapbox/carto/milestones/0.16.2","labels_url":"https://api.github.com/repos/mapbox/carto/milestones/9/labels","id":1732600,"number":9,"title":"0.16.2","description":"","creator":{"login":"nebulon42","id":3531092,"avatar_url":"https://avatars.githubusercontent.com/u/3531092?v=3","gravatar_id":"","url":"https://api.github.com/users/nebulon42","html_url":"https://github.com/nebulon42","followers_url":"https://api.github.com/users/nebulon42/followers","following_url":"https://api.github.com/users/nebulon42/following{/other_user}","gists_url":"https://api.github.com/users/nebulon42/gists{/gist_id}","starred_url":"https://api.github.com/users/nebulon42/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/nebulon42/subscriptions","organizations_url":"https://api.github.com/users/nebulon42/orgs","repos_url":"https://api.github.com/users/nebulon42/repos","events_url":"https://api.github.com/users/nebulon42/events{/privacy}","received_events_url":"https://api.github.com/users/nebulon42/received_events","type":"User","site_admin":false},"open_issues":0,"closed_issues":1,"state":"open","created_at":"2016-04-26T19:28:47Z","updated_at":"2016-04-26T19:29:07Z","due_on":null,"closed_at":null},"comments":3,"created_at":"2016-04-26T17:27:00Z","updated_at":"2016-04-26T19:45:32Z","closed_at":"2016-04-26T19:26:10Z","body":"```css\r\n@water: #a0c8f0;\r\n\r\n#water {\r\n  polygon-fill: @water - #111;\r\n}\r\n```\r\n\r\nThis gives `#8fb7df` in carto v0.15.x and `#838383` in carto v0.16.x"},"comment":{"url":"https://api.github.com/repos/mapbox/carto/issues/comments/214863948","html_url":"https://github.com/mapbox/carto/issues/443#issuecomment-214863948","issue_url":"https://api.github.com/repos/mapbox/carto/issues/443","id":214863948,"user":{"login":"pnorman","id":1190866,"avatar_url":"https://avatars.githubusercontent.com/u/1190866?v=3","gravatar_id":"","url":"https://api.github.com/users/pnorman","html_url":"https://github.com/pnorman","followers_url":"https://api.github.com/users/pnorman/followers","following_url":"https://api.github.com/users/pnorman/following{/other_user}","gists_url":"https://api.github.com/users/pnorman/gists{/gist_id}","starred_url":"https://api.github.com/users/pnorman/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/pnorman/subscriptions","organizations_url":"https://api.github.com/users/pnorman/orgs","repos_url":"https://api.github.com/users/pnorman/repos","events_url":"https://api.github.com/users/pnorman/events{/privacy}","received_events_url":"https://api.github.com/users/pnorman/received_events","type":"User","site_admin":false},"created_at":"2016-04-26T19:45:32Z","updated_at":"2016-04-26T19:45:32Z","body":"fwiw, I'm not sure that subtracting one color from another and rendering the result makes sense. When you subtract colours you get a colour difference, which you could then add to another colour. The semantics of this are similar to datetimes and intervals"}}