Improved testing of integer-type arguments

src/main/java/rife/bld/extension/CompileKotlinOptions.java

@@ -65,6 +65,17 @@ public class CompileKotlinOptions {
         return this;
     }
 
+    /**
+     * Allow using declarations only from the specified version of Kotlin bundled libraries.
+     *
+     * @param version the api version
+     * @return this operation instance
+     */
+    public CompileKotlinOptions apiVersion(int version) {
+        apiVersion_ = String.valueOf(version);
+        return this;
+    }
+
     /**
      * Read the compiler options from the given files.
      * <p>