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Lib definition for isNaN wrong #19153

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eseliger opened this issue Oct 13, 2017 · 2 comments
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Lib definition for isNaN wrong #19153

eseliger opened this issue Oct 13, 2017 · 2 comments
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@eseliger
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isNaN(0)
isNaN('120')
isNaN(new Date())

Expected behavior:
isNaN should also take string and Date and pretty much everything, probably any
See here in the examples section

Actual behavior:
It only takes number https://github.com/Microsoft/TypeScript/blob/master/lib/lib.es5.d.ts#L53
@trotyl
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trotyl commented Oct 13, 2017 •
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It's by design, see #3947, #4002, #11414, #13227, #15173, #16427.

@ghost ghost added the Duplicate An existing issue was already created label Oct 13, 2017
@RyanCavanaugh
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@eseliger please do read the instructions and search for existing issues before logging new ones

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@jcalz jcalz mentioned this issue Jan 8, 2018
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@trotyl @RyanCavanaugh @eseliger