Add Kotlin compiler configuration

build.gradle.kts

@@ -1,5 +1,6 @@
 import org.jetbrains.dokka.DokkaConfiguration
 import org.jetbrains.dokka.gradle.DokkaTask
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
 import java.net.URI
 
 /*
@@ -94,6 +95,17 @@ allprojects {
         }
     }
 
+    // Kotlin
+    kotlin.compilerOptions {
+        // Configuration
+        progressiveMode = true
+        allWarningsAsErrors = true
+        verbose = true
+
+        // Set target metadata
+        jvmTarget = JvmTarget.valueOf("JVM_${property("java") as String}")
+    }
+
     // Dokka
     // -> Register jar generation tasks
     //    See https://kotlinlang.org/docs/dokka-gradle.html#build-javadoc-jar

gradle.properties

@@ -30,7 +30,7 @@ versionTyperelease=10
 versionFork=
 versionCompanion=
 
-# Java
+# Language versions
 java=21
 
 # Dependencies