[Kotlin] Use of ExperimentalUnsignedTypes annotation in generated kotlin code

[aaronriekenberg]

In Feb 2022 I made a PR to remove ExperimentalUnsignedTypes annotations on generated kotlin code, which was merged: #7092

I notice recently the generation of ExperimentalUnsignedTypes was added back to kotlin code generator: #7775

I am seeing with flatc version 23.3.3 this annotation is getting generated.

May I ask why this change was made in PR 7775 above?

In Kotlin >= 1.5 unsigned types are not experimental https://kotlinlang.org/docs/whatsnew15.html#stable-unsigned-integer-types

Putting this annotation into generated files generates a large number of compiler warnings for users of the code, unless the users code also contains @ExperimentalUnsignedTypes annotations.

Thanks!

[dbaileychess]

@anton-bobukh Could you comment if possible?

[paulovap]

Unsigned arrays are still experimental. So maybe the code generator could be improve to only generate the annotation with the usage of that.

[aaronriekenberg]

Attempted a PR that I think might work to make the ExperimentalUnsignedTypes annotation opt-in only if unsigned array types are actually used. #7881

Please take a look - thank you!