Wrong gson deserialization of list of integers

[tgodzik]

Compiler version

3.3.0

Minimized code

//> using dep com.google.code.gson:gson:2.10.1
//> using scala 3.3.0

import com.google.gson.Gson
import scala.jdk.CollectionConverters._

case class HasArray(
    argIndices: java.util.List[Integer]
)

object Main {

  def main(args: Array[String]): Unit = {
    val gson = new Gson();
    val arr =
      gson.fromJson[HasArray]("{ \"argIndices\" : [1,2,3]}", classOf[HasArray])
    println(arr.argIndices)
  }
}

Output

[1.0, 2.0, 3.0]

the elements in the list are actually Doubles.

Expectation

[1, 2, 3]

This worked ok in the previous Scala versions 2.13.x.

[SethTisue]

fixed in 3.4.0, but 3.3.6-RC1-bin-20250128-c189755-NIGHTLY still shows the old behavior

I did not attempt to identify the responsible PR

[som-snytt]

@SethTisue fixed by #19207 which could be backport-nominated