In JS, was chiefly undefined-ness / nullability. I’d make a typo; some value computed from that value would be undefined, then coerced to 0…
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flowtype.org/docs/union-int
If TS supports tagged unions, we’re good! Can you link me to docs on nullability on TS? :)
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More on unions: flowtype.org/blog/2015/07/0. Flow is probably a better fit but less mature. Maybe better anyway.
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