{"action":"opened","issue":{"url":"https://api.github.com/repos/unitsofmeasurement/unit-api/issues/98","repository_url":"https://api.github.com/repos/unitsofmeasurement/unit-api","labels_url":"https://api.github.com/repos/unitsofmeasurement/unit-api/issues/98/labels{/name}","comments_url":"https://api.github.com/repos/unitsofmeasurement/unit-api/issues/98/comments","events_url":"https://api.github.com/repos/unitsofmeasurement/unit-api/issues/98/events","html_url":"https://github.com/unitsofmeasurement/unit-api/issues/98","id":333045060,"node_id":"MDU6SXNzdWUzMzMwNDUwNjA=","number":98,"title":"Result of A + B shall be determinist","user":{"login":"desruisseaux","id":1324414,"node_id":"MDQ6VXNlcjEzMjQ0MTQ=","avatar_url":"https://avatars2.githubusercontent.com/u/1324414?v=4","gravatar_id":"","url":"https://api.github.com/users/desruisseaux","html_url":"https://github.com/desruisseaux","followers_url":"https://api.github.com/users/desruisseaux/followers","following_url":"https://api.github.com/users/desruisseaux/following{/other_user}","gists_url":"https://api.github.com/users/desruisseaux/gists{/gist_id}","starred_url":"https://api.github.com/users/desruisseaux/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/desruisseaux/subscriptions","organizations_url":"https://api.github.com/users/desruisseaux/orgs","repos_url":"https://api.github.com/users/desruisseaux/repos","events_url":"https://api.github.com/users/desruisseaux/events{/privacy}","received_events_url":"https://api.github.com/users/desruisseaux/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2018-06-17T08:15:18Z","updated_at":"2018-06-17T08:15:18Z","closed_at":null,"author_association":"CONTRIBUTOR","body":"The result of `Quantity.add(Quantity)` shall be numerically equivalent for all implementations. \"Numerically equivalent\" means that they shall have the same numerical value (ignoring rounding errors) after conversion to the same unit by `Quantity.to(Unit)`.\r\n\r\n**Example:** 1 m + 2 cm = 1.02 m or 102 cm, at implementation choice. But can not be 2 meters.\r\n\r\nThe problem become more tricky with temperature: 1°C + 2°C may be 3°C or 276.15 °C, depending on whether the 1°C and 2°C quantities are temperature _measurements_ or temperature _increments_. It is not the purpose of this issue to decide which interpretation should be applied. The purpose of this issue is to state that **whatever interpretation is choose, the specification should describe it with enough details for ensuring that all implementations produce numerically equivalent results.**\r\n"}}
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