diff --git a/native/commonizer/src/org/jetbrains/kotlin/commonizer/core/OptimisticNumbersTypeCommonizer.kt b/native/commonizer/src/org/jetbrains/kotlin/commonizer/core/OptimisticNumbersTypeCommonizer.kt
index b983cae0ccb..b06f2599d06 100644
--- a/native/commonizer/src/org/jetbrains/kotlin/commonizer/core/OptimisticNumbersTypeCommonizer.kt
+++ b/native/commonizer/src/org/jetbrains/kotlin/commonizer/core/OptimisticNumbersTypeCommonizer.kt
@@ -7,6 +7,7 @@ package org.jetbrains.kotlin.commonizer.core
 
 import org.jetbrains.kotlin.commonizer.cir.CirClassType
 import org.jetbrains.kotlin.commonizer.cir.CirEntityId
+import org.jetbrains.kotlin.commonizer.utils.*
 
 private typealias BitWidth = Int
 
@@ -21,51 +22,51 @@ private class SubstitutableNumbers(private val numbers: Map<CirEntityId, BitWidt
 
 private val signedIntegers = SubstitutableNumbers(
     mapOf(
-        CirEntityId.create("kotlin/Byte") to 8,
-        CirEntityId.create("kotlin/Short") to 16,
-        CirEntityId.create("kotlin/Int") to 32,
-        CirEntityId.create("kotlin/Long") to 64
+        CirEntityId.create(KOTLIN_BYTE_ID) to 8,
+        CirEntityId.create(KOTLIN_SHORT_ID) to 16,
+        CirEntityId.create(KOTLIN_INT_ID) to 32,
+        CirEntityId.create(KOTLIN_LONG_ID) to 64
     )
 )
 
 private val unsignedIntegers = SubstitutableNumbers(
     mapOf(
-        CirEntityId.create("kotlin/UByte") to 8,
-        CirEntityId.create("kotlin/UShort") to 16,
-        CirEntityId.create("kotlin/UInt") to 32,
-        CirEntityId.create("kotlin/ULong") to 64
+        CirEntityId.create(KOTLIN_UBYTE_ID) to 8,
+        CirEntityId.create(KOTLIN_USHORT_ID) to 16,
+        CirEntityId.create(KOTLIN_UINT_ID) to 32,
+        CirEntityId.create(KOTLIN_ULONG_ID) to 64
     )
 )
 
 private val floatingPoints = SubstitutableNumbers(
     mapOf(
-        CirEntityId.create("kotlin/Float") to 32,
-        CirEntityId.create("kotlin/Double") to 64,
+        CirEntityId.create(KOTLIN_FLOAT_ID) to 32,
+        CirEntityId.create(KOTLIN_DOUBLE_ID) to 64,
     )
 )
 
 private val signedVarIntegers = SubstitutableNumbers(
     mapOf(
-        CirEntityId.create("kotlinx/cinterop/ByteVarOf") to 8,
-        CirEntityId.create("kotlinx/cinterop/ShortVarOf") to 16,
-        CirEntityId.create("kotlinx/cinterop/IntVarOf") to 32,
-        CirEntityId.create("kotlinx/cinterop/LongVarOf") to 64,
+        CirEntityId.create(BYTE_VAR_OF_ID) to 8,
+        CirEntityId.create(SHORT_VAR_OF_ID) to 16,
+        CirEntityId.create(INT_VAR_OF_ID) to 32,
+        CirEntityId.create(LONG_VAR_OF_ID) to 64,
     )
 )
 
 private val unsignedVarIntegers = SubstitutableNumbers(
     mapOf(
-        CirEntityId.create("kotlinx/cinterop/UByteVarOf") to 8,
-        CirEntityId.create("kotlinx/cinterop/UShortVarOf") to 16,
-        CirEntityId.create("kotlinx/cinterop/UIntVarOf") to 32,
-        CirEntityId.create("kotlinx/cinterop/ULongVarOf") to 64,
+        CirEntityId.create(UBYTE_VAR_OF_ID) to 8,
+        CirEntityId.create(USHORT_VAR_OF_ID) to 16,
+        CirEntityId.create(UINT_VAR_OF_ID) to 32,
+        CirEntityId.create(ULONG_VAR_OF_ID) to 64,
     )
 )
 
 private val floatingPointVars = SubstitutableNumbers(
     mapOf(
-        CirEntityId.create("kotlinx/cinterop/FloatVarOf") to 32,
-        CirEntityId.create("kotlinx/cinterop/DoubleVarOf") to 64,
+        CirEntityId.create(FLOAT_VAR_OF_ID) to 32,
+        CirEntityId.create(DOUBLE_VAR_OF_ID) to 64,
     )
 )
 
diff --git a/native/commonizer/src/org/jetbrains/kotlin/commonizer/core/PlatformIntegerCommonizer.kt b/native/commonizer/src/org/jetbrains/kotlin/commonizer/core/PlatformIntegerCommonizer.kt
index c7af5739212..182e99d6c52 100644
--- a/native/commonizer/src/org/jetbrains/kotlin/commonizer/core/PlatformIntegerCommonizer.kt
+++ b/native/commonizer/src/org/jetbrains/kotlin/commonizer/core/PlatformIntegerCommonizer.kt
@@ -6,11 +6,14 @@
 package org.jetbrains.kotlin.commonizer.core
 
 import org.jetbrains.kotlin.commonizer.CommonizerTarget
-import org.jetbrains.kotlin.commonizer.cir.*
+import org.jetbrains.kotlin.commonizer.cir.CirClassOrTypeAliasType
+import org.jetbrains.kotlin.commonizer.cir.CirClassType
+import org.jetbrains.kotlin.commonizer.cir.CirEntityId
+import org.jetbrains.kotlin.commonizer.cir.CirTypeProjection
 import org.jetbrains.kotlin.commonizer.mergedtree.CirKnownClassifiers
 import org.jetbrains.kotlin.commonizer.mergedtree.PlatformIntWidth
 import org.jetbrains.kotlin.commonizer.mergedtree.PlatformWidthIndex
-import org.jetbrains.kotlin.descriptors.konan.*
+import org.jetbrains.kotlin.commonizer.utils.*
 import org.jetbrains.kotlin.name.ClassId
 import org.jetbrains.kotlin.utils.SmartList
 
diff --git a/native/commonizer/src/org/jetbrains/kotlin/commonizer/utils/names.kt b/native/commonizer/src/org/jetbrains/kotlin/commonizer/utils/names.kt
index 6e65d187479..ea7010c6979 100644
--- a/native/commonizer/src/org/jetbrains/kotlin/commonizer/utils/names.kt
+++ b/native/commonizer/src/org/jetbrains/kotlin/commonizer/utils/names.kt
@@ -10,6 +10,7 @@ import org.jetbrains.kotlin.builtins.StandardNames
 import org.jetbrains.kotlin.commonizer.cir.CirEntityId
 import org.jetbrains.kotlin.commonizer.cir.CirName
 import org.jetbrains.kotlin.commonizer.cir.CirPackageName
+import org.jetbrains.kotlin.name.ClassId
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.serialization.konan.impl.ForwardDeclarationsFqNames
@@ -76,4 +77,63 @@ internal val CirEntityId.isObjCInteropCallableAnnotation: Boolean
     get() = this == COMMONIZER_OBJC_INTEROP_CALLABLE_ANNOTATION_ID ||
             packageName == CINTEROP_PACKAGE && relativeNameSegments.singleOrNull() in OBJC_INTEROP_CALLABLE_ANNOTATIONS
 
+// platform integers/optimistic commonization
 
+val KOTLIN_BYTE_ID = ClassId.fromString("kotlin/Byte")
+val KOTLIN_SHORT_ID = ClassId.fromString("kotlin/Short")
+val KOTLIN_INT_ID = ClassId.fromString("kotlin/Int")
+val KOTLIN_LONG_ID = ClassId.fromString("kotlin/Long")
+
+val KOTLIN_UBYTE_ID = ClassId.fromString("kotlin/UByte")
+val KOTLIN_USHORT_ID = ClassId.fromString("kotlin/UShort")
+val KOTLIN_UINT_ID = ClassId.fromString("kotlin/UInt")
+val KOTLIN_ULONG_ID = ClassId.fromString("kotlin/ULong")
+
+val KOTLIN_FLOAT_ID = ClassId.fromString("kotlin/Float")
+val KOTLIN_DOUBLE_ID = ClassId.fromString("kotlin/Double")
+
+val BYTE_VAR_OF_ID = ClassId.fromString("kotlinx/cinterop/ByteVarOf")
+val SHORT_VAR_OF_ID = ClassId.fromString("kotlinx/cinterop/ShortVarOf")
+val INT_VAR_OF_ID = ClassId.fromString("kotlinx/cinterop/IntVarOf")
+val LONG_VAR_OF_ID = ClassId.fromString("kotlinx/cinterop/LongVarOf")
+
+val UBYTE_VAR_OF_ID = ClassId.fromString("kotlinx/cinterop/UByteVarOf")
+val USHORT_VAR_OF_ID = ClassId.fromString("kotlinx/cinterop/UShortVarOf")
+val UINT_VAR_OF_ID = ClassId.fromString("kotlinx/cinterop/UIntVarOf")
+val ULONG_VAR_OF_ID = ClassId.fromString("kotlinx/cinterop/ULongVarOf")
+
+val FLOAT_VAR_OF_ID = ClassId.fromString("kotlinx/cinterop/FloatVarOf")
+val DOUBLE_VAR_OF_ID = ClassId.fromString("kotlinx/cinterop/DoubleVarOf")
+
+val INT_ARRAY_ID = ClassId.fromString("kotlin/IntArray")
+val LONG_ARRAY_ID = ClassId.fromString("kotlin/LongArray")
+
+val UINT_ARRAY_ID = ClassId.fromString("kotlin/UIntArray")
+val ULONG_ARRAY_ID = ClassId.fromString("kotlin/ULongArray")
+
+val INT_RANGE_ID = ClassId.fromString("kotlin/ranges/IntRange")
+val LONG_RANGE_ID = ClassId.fromString("kotlin/ranges/LongRange")
+
+val UINT_RANGE_ID = ClassId.fromString("kotlin/ranges/UIntRange")
+val ULONG_RANGE_ID = ClassId.fromString("kotlin/ranges/ULongRange")
+
+val INT_PROGRESSION_ID = ClassId.fromString("kotlin/ranges/IntProgression")
+val LONG_PROGRESSION_ID = ClassId.fromString("kotlin/ranges/LongProgression")
+
+val UINT_PROGRESSION_ID = ClassId.fromString("kotlin/ranges/UIntProgression")
+val ULONG_PROGRESSION_ID = ClassId.fromString("kotlin/ranges/ULongProgression")
+
+val PLATFORM_INT_ID = ClassId.fromString("kotlin/PlatformInt")
+val PLATFORM_UINT_ID = ClassId.fromString("kotlin/PlatformUInt")
+
+val PLATFORM_INT_VAR_OF_ID = ClassId.fromString("kotlinx/cinterop/PlatformIntVarOf")
+val PLATFORM_UINT_VAR_OF_ID = ClassId.fromString("kotlinx/cinterop/PlatformUIntVarOf")
+
+val PLATFORM_INT_ARRAY_ID = ClassId.fromString("kotlin/PlatformIntArray")
+val PLATFORM_UINT_ARRAY_ID = ClassId.fromString("kotlin/PlatformUIntArray")
+
+val PLATFORM_INT_RANGE_ID = ClassId.fromString("kotlin/ranges/PlatformIntRange")
+val PLATFORM_UINT_RANGE_ID = ClassId.fromString("kotlin/ranges/PlatformUIntRange")
+
+val PLATFORM_INT_PROGRESSION_ID = ClassId.fromString("kotlin/ranges/PlatformIntProgression")
+val PLATFORM_UINT_PROGRESSION_ID = ClassId.fromString("kotlin/ranges/PlatformUIntProgression")
diff --git a/native/frontend/src/org/jetbrains/kotlin/descriptors/konan/PlatformIntegerClassIds.kt b/native/frontend/src/org/jetbrains/kotlin/descriptors/konan/PlatformIntegerClassIds.kt
deleted file mode 100644
index 20101b7405c..00000000000
--- a/native/frontend/src/org/jetbrains/kotlin/descriptors/konan/PlatformIntegerClassIds.kt
+++ /dev/null
@@ -1,76 +0,0 @@
-/*
- * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
- * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
- */
-
-package org.jetbrains.kotlin.descriptors.konan
-
-import org.jetbrains.kotlin.name.ClassId
-
-val KOTLIN_INT_ID = ClassId.fromString("kotlin/Int")
-val KOTLIN_LONG_ID = ClassId.fromString("kotlin/Long")
-
-val KOTLIN_UINT_ID = ClassId.fromString("kotlin/UInt")
-val KOTLIN_ULONG_ID = ClassId.fromString("kotlin/ULong")
-
-val INT_VAR_OF_ID = ClassId.fromString("kotlinx/cinterop/IntVarOf")
-val LONG_VAR_OF_ID = ClassId.fromString("kotlinx/cinterop/LongVarOf")
-
-val UINT_VAR_OF_ID = ClassId.fromString("kotlinx/cinterop/UIntVarOf")
-val ULONG_VAR_OF_ID = ClassId.fromString("kotlinx/cinterop/ULongVarOf")
-
-val INT_ARRAY_ID = ClassId.fromString("kotlin/IntArray")
-val LONG_ARRAY_ID = ClassId.fromString("kotlin/LongArray")
-
-val UINT_ARRAY_ID = ClassId.fromString("kotlin/UIntArray")
-val ULONG_ARRAY_ID = ClassId.fromString("kotlin/ULongArray")
-
-val INT_RANGE_ID = ClassId.fromString("kotlin/ranges/IntRange")
-val LONG_RANGE_ID = ClassId.fromString("kotlin/ranges/LongRange")
-
-val UINT_RANGE_ID = ClassId.fromString("kotlin/ranges/UIntRange")
-val ULONG_RANGE_ID = ClassId.fromString("kotlin/ranges/ULongRange")
-
-val INT_PROGRESSION_ID = ClassId.fromString("kotlin/ranges/IntProgression")
-val LONG_PROGRESSION_ID = ClassId.fromString("kotlin/ranges/LongProgression")
-
-val UINT_PROGRESSION_ID = ClassId.fromString("kotlin/ranges/UIntProgression")
-val ULONG_PROGRESSION_ID = ClassId.fromString("kotlin/ranges/ULongProgression")
-
-val PLATFORM_INT_ID = ClassId.fromString("kotlin/PlatformInt")
-val PLATFORM_UINT_ID = ClassId.fromString("kotlin/PlatformUInt")
-
-val PLATFORM_INT_VAR_OF_ID = ClassId.fromString("kotlinx/cinterop/PlatformIntVarOf")
-val PLATFORM_UINT_VAR_OF_ID = ClassId.fromString("kotlinx/cinterop/PlatformUIntVarOf")
-
-val PLATFORM_INT_ARRAY_ID = ClassId.fromString("kotlin/PlatformIntArray")
-val PLATFORM_UINT_ARRAY_ID = ClassId.fromString("kotlin/PlatformUIntArray")
-
-val PLATFORM_INT_RANGE_ID = ClassId.fromString("kotlin/ranges/PlatformIntRange")
-val PLATFORM_UINT_RANGE_ID = ClassId.fromString("kotlin/ranges/PlatformUIntRange")
-
-val PLATFORM_INT_PROGRESSION_ID = ClassId.fromString("kotlin/ranges/PlatformIntProgression")
-val PLATFORM_UINT_PROGRESSION_ID = ClassId.fromString("kotlin/ranges/PlatformUIntProgression")
-
-val PLATFORM_INTEGERS: Set<ClassId> = setOf(
-    PLATFORM_INT_ID, PLATFORM_UINT_ID
-)
-
-val PLATFORM_VARIABLES: Set<ClassId> = setOf(
-    PLATFORM_INT_VAR_OF_ID, PLATFORM_UINT_VAR_OF_ID
-)
-
-val PLATFORM_ARRAYS: Set<ClassId> = setOf(
-    PLATFORM_INT_ARRAY_ID, PLATFORM_UINT_ARRAY_ID
-)
-
-val PLATFORM_RANGES: Set<ClassId> = setOf(
-    PLATFORM_INT_RANGE_ID, PLATFORM_UINT_RANGE_ID
-)
-
-val PLATFORM_PROGRESSIONS: Set<ClassId> = setOf(
-    PLATFORM_INT_PROGRESSION_ID, PLATFORM_UINT_PROGRESSION_ID
-)
-
-val PLATFORM_TYPES: Set<ClassId> =
-    PLATFORM_INTEGERS + PLATFORM_VARIABLES + PLATFORM_ARRAYS + PLATFORM_RANGES + PLATFORM_PROGRESSIONS