diff --git a/impl/src/jvmMain/kotlin/ru/landgrafhomyak/kotlin/kmp_gradle_build_helper/improvements.kt b/impl/src/jvmMain/kotlin/ru/landgrafhomyak/kotlin/kmp_gradle_build_helper/improvements.kt
new file mode 100644
index 0000000..bd859f8
--- /dev/null
+++ b/impl/src/jvmMain/kotlin/ru/landgrafhomyak/kotlin/kmp_gradle_build_helper/improvements.kt
@@ -0,0 +1,22 @@
+package ru.landgrafhomyak.kotlin.kmp_gradle_build_helper
+
+import org.jetbrains.kotlin.gradle.dsl.KotlinMultiplatformExtension
+
+
+public enum class Improvements {
+	JAVA_INTERFACES_DEFAULT_METHODS {
+		// since kotlin 1.4
+		override fun fix(target: KotlinMultiplatformExtension) {
+			target.configureAllCompilersOptions { freeCompilerArgs.add("-Xjvm-default=all") }
+		}
+	};
+
+	internal abstract fun fix(target: KotlinMultiplatformExtension)
+}
+
+
+public fun KotlinMultiplatformExtension.fixAllStrangeBehavioursExcept(vararg except: Improvements) {
+	(Improvements.values().toSet() - except.toSet()).forEach { f -> f.fix(this) }
+}
+
+public fun KotlinMultiplatformExtension.fixAllStrangeBehaviours(): Unit = this.fixAllStrangeBehavioursExcept()
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