> Property existence: key in object, typing `key?: T` i have no idea what that's supposed to mean. Presumably you're using a TypeScript-ism? > JSON: got it co

> Property existence: key in object, typing `key?: T` i have no idea what that's supposed to mean. Presumably you're using a TypeScript-ism? > JSON: got it completely wrong. Agree with it or not, it's what we have. Having implemented several JSON parsers and reformaters, i wholeheartedly with every one of JSON's design choices, including the lack of specification about integer sizes. Douglas Crockford did it exactly right, as far as i'm concerned.