diff --git a/libraries/tools/binary-compatibility-validator/reference-public-api/kotlin-gradle-plugin-idea.txt b/libraries/tools/binary-compatibility-validator/reference-public-api/kotlin-gradle-plugin-idea.txt
index b6acfe7d6b6..c24cbdda451 100644
--- a/libraries/tools/binary-compatibility-validator/reference-public-api/kotlin-gradle-plugin-idea.txt
+++ b/libraries/tools/binary-compatibility-validator/reference-public-api/kotlin-gradle-plugin-idea.txt
@@ -56,13 +56,13 @@ public abstract interface class org/jetbrains/kotlin/gradle/kpm/idea/IdeaKotlinC
 }
 
 public abstract interface class org/jetbrains/kotlin/gradle/kpm/idea/IdeaKotlinFragment : java/io/Serializable {
-	public abstract fun getDependencies ()Ljava/util/Collection;
-	public abstract fun getDirectRefinesDependencies ()Ljava/util/Collection;
+	public abstract fun getDependencies ()Ljava/util/List;
+	public abstract fun getDirectRefinesDependencies ()Ljava/util/List;
 	public abstract fun getExternal ()Lorg/jetbrains/kotlin/gradle/kpm/KotlinExternalModelContainer;
 	public abstract fun getLanguageSettings ()Lorg/jetbrains/kotlin/gradle/kpm/idea/IdeaKotlinLanguageSettings;
 	public abstract fun getName ()Ljava/lang/String;
-	public abstract fun getResourceDirectories ()Ljava/util/Collection;
-	public abstract fun getSourceDirectories ()Ljava/util/Collection;
+	public abstract fun getResourceDirectories ()Ljava/util/List;
+	public abstract fun getSourceDirectories ()Ljava/util/List;
 }
 
 public abstract interface class org/jetbrains/kotlin/gradle/kpm/idea/IdeaKotlinFragmentDependency : java/io/Serializable {
@@ -70,12 +70,12 @@ public abstract interface class org/jetbrains/kotlin/gradle/kpm/idea/IdeaKotlinF
 
 public abstract interface class org/jetbrains/kotlin/gradle/kpm/idea/IdeaKotlinLanguageSettings : java/io/Serializable {
 	public abstract fun getApiVersion ()Ljava/lang/String;
-	public abstract fun getCompilerPluginArguments ()Ljava/util/Collection;
-	public abstract fun getCompilerPluginClasspath ()Ljava/util/Collection;
-	public abstract fun getEnabledLanguageFeatures ()Ljava/util/Collection;
-	public abstract fun getFreeCompilerArgs ()Ljava/util/Collection;
+	public abstract fun getCompilerPluginArguments ()Ljava/util/List;
+	public abstract fun getCompilerPluginClasspath ()Ljava/util/List;
+	public abstract fun getEnabledLanguageFeatures ()Ljava/util/Set;
+	public abstract fun getFreeCompilerArgs ()Ljava/util/List;
 	public abstract fun getLanguageVersion ()Ljava/lang/String;
-	public abstract fun getOptInAnnotationsInUse ()Ljava/util/Collection;
+	public abstract fun getOptInAnnotationsInUse ()Ljava/util/Set;
 	public abstract fun isProgressiveMode ()Z
 }
 
diff --git a/libraries/tools/kotlin-gradle-plugin-idea/src/main/kotlin/org/jetbrains/kotlin/gradle/kpm/idea/IdeaKotlinFragment.kt b/libraries/tools/kotlin-gradle-plugin-idea/src/main/kotlin/org/jetbrains/kotlin/gradle/kpm/idea/IdeaKotlinFragment.kt
index 3edc81b14ae..de38830679d 100644
--- a/libraries/tools/kotlin-gradle-plugin-idea/src/main/kotlin/org/jetbrains/kotlin/gradle/kpm/idea/IdeaKotlinFragment.kt
+++ b/libraries/tools/kotlin-gradle-plugin-idea/src/main/kotlin/org/jetbrains/kotlin/gradle/kpm/idea/IdeaKotlinFragment.kt
@@ -11,10 +11,10 @@ import java.io.Serializable
 interface IdeaKotlinFragment : Serializable {
     val name: String
     val languageSettings: IdeaKotlinLanguageSettings?
-    val dependencies: Collection<IdeaKotlinFragmentDependency>
-    val directRefinesDependencies: Collection<IdeaKotlinFragment>
-    val sourceDirectories: Collection<IdeaKotlinSourceDirectory>
-    val resourceDirectories: Collection<IdeaKotlinResourceDirectory>
+    val dependencies: List<IdeaKotlinFragmentDependency>
+    val directRefinesDependencies: List<IdeaKotlinFragment>
+    val sourceDirectories: List<IdeaKotlinSourceDirectory>
+    val resourceDirectories: List<IdeaKotlinResourceDirectory>
     val external: KotlinExternalModelContainer
 }
 
@@ -22,10 +22,10 @@ interface IdeaKotlinFragment : Serializable {
 data class IdeaKotlinFragmentImpl(
     override val name: String,
     override val languageSettings: IdeaKotlinLanguageSettings?,
-    override val dependencies: Collection<IdeaKotlinFragmentDependency>,
-    override val directRefinesDependencies: Collection<IdeaKotlinFragment>,
-    override val sourceDirectories: Collection<IdeaKotlinSourceDirectory>,
-    override val resourceDirectories: Collection<IdeaKotlinResourceDirectory>,
+    override val dependencies: List<IdeaKotlinFragmentDependency>,
+    override val directRefinesDependencies: List<IdeaKotlinFragment>,
+    override val sourceDirectories: List<IdeaKotlinSourceDirectory>,
+    override val resourceDirectories: List<IdeaKotlinResourceDirectory>,
     override val external: KotlinExternalModelContainer
 ) : IdeaKotlinFragment {
 
diff --git a/libraries/tools/kotlin-gradle-plugin-idea/src/main/kotlin/org/jetbrains/kotlin/gradle/kpm/idea/IdeaKotlinLanguageSettings.kt b/libraries/tools/kotlin-gradle-plugin-idea/src/main/kotlin/org/jetbrains/kotlin/gradle/kpm/idea/IdeaKotlinLanguageSettings.kt
index 32d3744af16..c5b78f090cf 100644
--- a/libraries/tools/kotlin-gradle-plugin-idea/src/main/kotlin/org/jetbrains/kotlin/gradle/kpm/idea/IdeaKotlinLanguageSettings.kt
+++ b/libraries/tools/kotlin-gradle-plugin-idea/src/main/kotlin/org/jetbrains/kotlin/gradle/kpm/idea/IdeaKotlinLanguageSettings.kt
@@ -12,11 +12,11 @@ interface IdeaKotlinLanguageSettings : Serializable {
     val languageVersion: String?
     val apiVersion: String?
     val isProgressiveMode: Boolean
-    val enabledLanguageFeatures: Collection<String>
-    val optInAnnotationsInUse: Collection<String>
-    val compilerPluginArguments: Collection<String>
-    val compilerPluginClasspath: Collection<File>
-    val freeCompilerArgs: Collection<String>
+    val enabledLanguageFeatures: Set<String>
+    val optInAnnotationsInUse: Set<String>
+    val compilerPluginArguments: List<String>
+    val compilerPluginClasspath: List<File>
+    val freeCompilerArgs: List<String>
 }
 
 @InternalKotlinGradlePluginApi
@@ -24,11 +24,11 @@ data class IdeaKotlinLanguageSettingsImpl(
     override val languageVersion: String?,
     override val apiVersion: String?,
     override val isProgressiveMode: Boolean,
-    override val enabledLanguageFeatures: Collection<String>,
-    override val optInAnnotationsInUse: Collection<String>,
-    override val compilerPluginArguments: Collection<String>,
-    override val compilerPluginClasspath: Collection<File>,
-    override val freeCompilerArgs: Collection<String>
+    override val enabledLanguageFeatures: Set<String>,
+    override val optInAnnotationsInUse: Set<String>,
+    override val compilerPluginArguments: List<String>,
+    override val compilerPluginClasspath: List<File>,
+    override val freeCompilerArgs: List<String>
 ) : IdeaKotlinLanguageSettings {
 
     @InternalKotlinGradlePluginApi