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kotlinlang

on JVM targets (but also in general) why do assertEquals with NaN arguments pass?  I'd expect
```kotlin.test.assertEquals(Double.NaN, Double.NaN, 1e-6)```
to fail because `Double.NaN != Double.NaN`

boxed, they're equal (`Map&lt;Double, *&gt;` would have issues otherwise)
unboxed, they're unequal (as per IEEE 754)

ah you're already using the primitive overload with the tolerance value. well it seems that kotlin.test special-cases that behavior <https://github.com/JetBrains/kotlin/blob/d520c37454e46f56e0af3013ae1da906bee40c6a/libraries/kotlin.test/common/src/main/kotlin/kotlin/test/Utils.kt#L30|https://github.com/JetBrains/kotlin/blob/d520c37454e46f56e0af3013ae1da906bee40c6a/[…]braries/kotlin.test/common/src/main/kotlin/kotlin/test/Utils.kt>

I'd argue that when using the tolerance values it should fail on NaNs since the tolerance only makes sense in numerical/computational contexts

The thing I got bitten by was when (arguably not so handy in hindsight) testing identities. Something along the lines of `assertEquals(a.distanceTo(c), b.distanceTo(c), 1e-6)`