diff --git a/libraries/tools/kotlin-stdlib-gen/src/templates/dsl/CommonTypes.kt b/libraries/tools/kotlin-stdlib-gen/src/templates/dsl/CommonTypes.kt
index 540015df051..94342fe7308 100644
--- a/libraries/tools/kotlin-stdlib-gen/src/templates/dsl/CommonTypes.kt
+++ b/libraries/tools/kotlin-stdlib-gen/src/templates/dsl/CommonTypes.kt
@@ -14,6 +14,7 @@ enum class Family {
     InvariantArraysOfObjects,
     ArraysOfObjects,
     ArraysOfPrimitives,
+    ArraysOfUnsigned,
     Sequences,
     CharSequences,
     Strings,
@@ -21,7 +22,8 @@ enum class Family {
     RangesOfPrimitives,
     ProgressionsOfPrimitives,
     Generic,
-    Primitives;
+    Primitives,
+    Unsigned;
 
     val isPrimitiveSpecialization: Boolean by lazy { this in primitiveSpecializations }
 
@@ -44,18 +46,27 @@ enum class PrimitiveType {
     Float,
     Double,
     Boolean,
-    Char;
+    Char,
+    // unsigned
+    UByte,
+    UShort,
+    UInt,
+    ULong;
 
     val capacity by lazy { descendingByDomainCapacity.indexOf(this).let { if (it < 0) it else descendingByDomainCapacity.size - it } }
 
     companion object {
-        val defaultPrimitives = PrimitiveType.values().toSet()
+        val unsignedPrimitives = setOf(UInt, ULong, UByte, UShort)
+        val defaultPrimitives = PrimitiveType.values().toSet() - unsignedPrimitives
         val numericPrimitives = setOf(Int, Long, Byte, Short, Double, Float)
         val integralPrimitives = setOf(Int, Long, Byte, Short, Char)
 
         val descendingByDomainCapacity = listOf(Double, Float, Long, Int, Short, Char, Byte)
+        val descendingByDomainCapacityUnsigned = listOf(ULong, UInt, UShort, UByte)
 
-        fun maxByCapacity(fromType: PrimitiveType, toType: PrimitiveType): PrimitiveType = descendingByDomainCapacity.first { it == fromType || it == toType }
+        fun maxByCapacity(fromType: PrimitiveType, toType: PrimitiveType): PrimitiveType =
+            (if (fromType in unsignedPrimitives) descendingByDomainCapacityUnsigned else descendingByDomainCapacity)
+                .first { it == fromType || it == toType }
     }
 }
 
diff --git a/libraries/tools/kotlin-stdlib-gen/src/templates/dsl/MemberBuilder.kt b/libraries/tools/kotlin-stdlib-gen/src/templates/dsl/MemberBuilder.kt
index 93bcc3465a3..4a4940b9dd0 100644
--- a/libraries/tools/kotlin-stdlib-gen/src/templates/dsl/MemberBuilder.kt
+++ b/libraries/tools/kotlin-stdlib-gen/src/templates/dsl/MemberBuilder.kt
@@ -15,10 +15,11 @@ private fun getDefaultSourceFile(f: Family): SourceFile = when (f) {
     Sets -> SourceFile.Sets
     Ranges, RangesOfPrimitives, ProgressionsOfPrimitives -> SourceFile.Ranges
     ArraysOfObjects, InvariantArraysOfObjects, ArraysOfPrimitives -> SourceFile.Arrays
+    ArraysOfUnsigned -> SourceFile.UArrays
     Maps -> SourceFile.Maps
     Strings -> SourceFile.Strings
     CharSequences -> SourceFile.Strings
-    Primitives, Generic -> SourceFile.Misc
+    Primitives, Generic, Unsigned -> SourceFile.Misc
 }
 
 @TemplateDsl
@@ -258,10 +259,10 @@ class MemberBuilder(
             Strings -> "String"
             CharSequences -> "CharSequence"
             Ranges -> "ClosedRange<$isAsteriskOrT>"
-            ArraysOfPrimitives -> primitive?.let { it.name + "Array" } ?: throw IllegalArgumentException("Primitive array should specify primitive type")
+            ArraysOfPrimitives, ArraysOfUnsigned -> primitive?.let { it.name + "Array" } ?: throw IllegalArgumentException("Primitive array should specify primitive type")
             RangesOfPrimitives -> primitive?.let { it.name + "Range" } ?: throw IllegalArgumentException("Primitive range should specify primitive type")
             ProgressionsOfPrimitives -> primitive?.let { it.name + "Progression" } ?: throw IllegalArgumentException("Primitive progression should specify primitive type")
-            Primitives -> primitive?.let { it.name } ?: throw IllegalArgumentException("Primitive should specify primitive type")
+            Primitives, Unsigned -> primitive?.let { it.name } ?: throw IllegalArgumentException("Primitive should specify primitive type")
             Generic -> primaryTypeParameter
         })
 
diff --git a/libraries/tools/kotlin-stdlib-gen/src/templates/dsl/SourceFile.kt b/libraries/tools/kotlin-stdlib-gen/src/templates/dsl/SourceFile.kt
index b511783d8e4..425f511cfc8 100644
--- a/libraries/tools/kotlin-stdlib-gen/src/templates/dsl/SourceFile.kt
+++ b/libraries/tools/kotlin-stdlib-gen/src/templates/dsl/SourceFile.kt
@@ -8,11 +8,13 @@ package templates
 enum class SourceFile(jvmClassName: String? = null, val multifile: Boolean = true, val packageName: String? = null) {
 
     Arrays(packageName = "kotlin.collections"),
+    UArrays(packageName = "kotlin.collections"),
     Collections(packageName = "kotlin.collections"),
     Sets(packageName = "kotlin.collections"),
     Maps(packageName = "kotlin.collections"),
     Sequences(packageName = "kotlin.sequences"),
     Ranges(packageName = "kotlin.ranges"),
+    URanges(packageName = "kotlin.ranges"),
     Comparisons(packageName = "kotlin.comparisons"),
     Strings(packageName = "kotlin.text"),
     Misc(),
diff --git a/libraries/tools/kotlin-stdlib-gen/src/templates/dsl/Templates.kt b/libraries/tools/kotlin-stdlib-gen/src/templates/dsl/Templates.kt
index 676844412b6..1cbb5d36c25 100644
--- a/libraries/tools/kotlin-stdlib-gen/src/templates/dsl/Templates.kt
+++ b/libraries/tools/kotlin-stdlib-gen/src/templates/dsl/Templates.kt
@@ -147,7 +147,11 @@ abstract class MemberTemplateDefinition<TParam> : MemberTemplate {
 
 
 private fun defaultPrimitives(f: Family): Set<PrimitiveType> =
-        if (f.isPrimitiveSpecialization) PrimitiveType.defaultPrimitives else emptySet()
+    when {
+        f == Family.Unsigned || f == Family.ArraysOfUnsigned -> PrimitiveType.unsignedPrimitives
+        f.isPrimitiveSpecialization -> PrimitiveType.defaultPrimitives
+        else -> emptySet()
+    }
 
 @TemplateDsl
 class FamilyPrimitiveMemberDefinition : MemberTemplateDefinition<PrimitiveType?>() {