he/him 
TIL `JSON.stringify(undefined) === undefined`. @flowtype and @typescriptlang both have incorrect type definitions of `string` instead of `string | void`.
Flow: https://github.com/facebook/flow/blob/master/lib/core.js#L477-L481 …
TypeScript:https://github.com/Microsoft/TypeScript/blob/master/lib/lib.es5.d.ts#L1063 …
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It would be a better idea to just disallow undefined as an input value for Flow. It’s not something that should be done anyway.
Need to disallow functions too: `JSON.stringify(function() {}) === undefined`.
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TypeScript is accepting PRs for this issuehttps://github.com/Microsoft/TypeScript/issues/18879 …
- End of conversation
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