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isNumber(NaN) #405

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imsfc opened this issue May 6, 2024 · 0 comments

imsfc commented May 6, 2024

typeof NaN // 'number'

isNumber(NaN) // false

function some(): number | number[] {
  return NaN
}

const ret = some()

if (isNumber(ret)) {
 // ret is number
 // Expecting NaN entering this branch
} else {
 // ret is number[]
}

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