📌 Fix:_.isNumber(NaN) now returnsfalse as expected (Fixes#5981)

🐛 The Issue

In Lodash v4.17.21, the_.isNumber function incorrectly returnstrue forNaN. This is problematic in scenarios where consumers of the library want to distinguish valid numbers fromNaN.

Reference:Issue #5981

✅ The Fix

TheisNumber function has been updated to returnfalse when the input isNaN. The logic now ensures that:

• PrimitiveNaN values are filtered out.
• BoxedNaN values (e.g.,Object(NaN)) are also handled appropriately.

functionisNumber(value){return(typeofvalue=='number'&&!Number.isNaN(value))||(isObjectLike(value)&&baseGetTag(value)==numberTag);}

🧪 Tests Updated

• Updated test case:assert.strictEqual(_.isNumber(NaN), false);
• Verified against full test suite usingpnpm test.
• All tests passing ✅