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fix: exclude NaN from isNumber (fixes #5981) #6007

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fix: exclude NaN from isNumber (fixes #5981) #6007

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ThivyaElangovan121121
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  • Handles both primitive and boxed NaNs.
  • Avoids calling Lodash methods inside Lodash internals — no recursion!
  • Safe across realms (e.g., iframes, VMs).
  • Avoids legacy quirks like ActiveX and non-standard behaviors.

@eglove
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eglove commented Aug 1, 2025 •
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I've been in support of this for a very long time. Last time it came up they said this was on purpose because NaN is a number in spec? But it defeats the purpose of a utility library to begin with. If we weren't accounting for edge cases like this, we'd just write flippant off the cuff custom utils.

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@Cassieminkus1 Cassieminkus1 Cassieminkus1 approved these changes

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@ThivyaElangovan121121 @eglove @Cassieminkus1 @GitUser121121