I wonder if anyone already found this bug, because...

# javascript

[MrPowerGamerBR]

I wonder if anyone already found this bug, because I wouldn't find anything related to this in YouTrack or in this channel

println("Test: ${"297153970613387264".toLong()}")

prints...

Test: 297153970613387260

Only happens with the IR compiler, not with the Legacy compiler, I actually thought this was a kotlinx.serialization bug until I tried debugging it further to find out that it is actually Kotlin that is having the issue! 😭

Tested in Kotlin 1.5.31, haven't tested in Kotlin 1.6.0 yet because Jetpack Compose Web doesn't support Kotlin 1.6.0... yet!

[MrPowerGamerBR]

It also seems to affect every Long value, it doesn't affect only toLong() conversions...

val value = 297153970613387264L
println("Real value: $value") // Real value: 297153970613387260

[MrPowerGamerBR]

If the value is a ULong, then this doesn't happen

val value = 297153970613387264u
println("Real value: $value") // Real value: 297153970613387264

[MrPowerGamerBR]

Created a YouTrack issue for this 🙂 https://youtrack.jetbrains.com/issue/KT-49913

[MrPowerGamerBR]

A workaround is converting the Long value to BigInteger (https://github.com/ionspin/kotlin-multiplatform-bignum) and then printing that as an String, that works fine

[ephemient]

https://youtrack.jetbrains.com/issue/KT-39891

[MrPowerGamerBR]

@ephemient well it looks like I haven't searched enough then 🙂, I wonder why I wasn't able to find this bug report before

[MrPowerGamerBR]

(well looks like I can't close my own issue 😭)

[Ayfri]

There is the BigInt class in JS, have you searched if it exists in Kt/JS ?

[ephemient]

it does not, https://youtrack.jetbrains.com/issue/KT-20912