diff --git a/docs/samples/happy_numbers.lyng.bad b/docs/samples/happy_numbers.lyng.bad
index c5810dc..e66d13f 100644
--- a/docs/samples/happy_numbers.lyng.bad
+++ b/docs/samples/happy_numbers.lyng.bad
@@ -21,10 +21,10 @@ import lyng.time
 //
 // After all optimizations it takes ~120ms.
 //
-//for( r in 1..100 ) {
-//    val start = Instant.now()
+for( r in 1..100 ) {
+    val start = Instant.now()
     val found = naiveCountHappyNumbers()
-//    println("Found happy numbers: %d time %s"(found, Instant.now() - start))
+    println("Found happy numbers: %d time %s"(found, Instant.now() - start))
     assert( found == 55252 )
-//    delay(0.01)
-//}
\ No newline at end of file
+    delay(0.1)
+}
\ No newline at end of file
diff --git a/lynglib/build.gradle.kts b/lynglib/build.gradle.kts
index 036ac7e..b242058 100644
--- a/lynglib/build.gradle.kts
+++ b/lynglib/build.gradle.kts
@@ -21,7 +21,7 @@ import org.jetbrains.kotlin.gradle.ExperimentalWasmDsl
 import org.jetbrains.kotlin.gradle.dsl.JvmTarget
 
 group = "net.sergeych"
-version = "0.9.1-SNAPSHOT"
+version = "0.9.2-SNAPSHOT"
 
 buildscript {
     repositories {
@@ -66,6 +66,7 @@ kotlin {
 //    iosArm64()
 //    iosSimulatorArm64()
     linuxX64()
+    linuxArm64()
     js {
         browser()
         nodejs()
@@ -79,9 +80,9 @@ kotlin {
     sourceSets {
         all {
             languageSettings.optIn("kotlinx.coroutines.ExperimentalCoroutinesApi")
-            languageSettings.optIn("kotlin.contracts.ExperimentalContracts")
             languageSettings.optIn("kotlin.ExperimentalUnsignedTypes")
             languageSettings.optIn("kotlin.coroutines.DelicateCoroutinesApi")
+            languageSettings.optIn("kotlin.contracts.ExperimentalContracts")
             languageSettings.optIn("kotlinx.coroutines.flow.DelicateCoroutinesApi")
         }
 
diff --git a/lynglib/src/commonMain/kotlin/net/sergeych/lyng/CompilerContext.kt b/lynglib/src/commonMain/kotlin/net/sergeych/lyng/CompilerContext.kt
index f5e7209..16f9b21 100644
--- a/lynglib/src/commonMain/kotlin/net/sergeych/lyng/CompilerContext.kt
+++ b/lynglib/src/commonMain/kotlin/net/sergeych/lyng/CompilerContext.kt
@@ -164,6 +164,7 @@ class CompilerContext(val tokens: List<Token>) {
         }
     }
 
+    @Suppress("NOTHING_TO_INLINE")
     inline fun addBreak() {
         breakFound = true
     }
diff --git a/lynglib/src/commonMain/kotlin/net/sergeych/lyng/Script.kt b/lynglib/src/commonMain/kotlin/net/sergeych/lyng/Script.kt
index da204bd..4f89647 100644
--- a/lynglib/src/commonMain/kotlin/net/sergeych/lyng/Script.kt
+++ b/lynglib/src/commonMain/kotlin/net/sergeych/lyng/Script.kt
@@ -26,6 +26,7 @@ import net.sergeych.lynon.ObjLynonClass
 import net.sergeych.mp_tools.globalDefer
 import kotlin.math.*
 
+@Suppress("TYPE_INTERSECTION_AS_REIFIED_WARNING")
 class Script(
     override val pos: Pos,
     private val statements: List<Statement> = emptyList(),
diff --git a/lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/Obj.kt b/lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/Obj.kt
index 19cd6be..b559a3a 100644
--- a/lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/Obj.kt
+++ b/lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/Obj.kt
@@ -367,6 +367,7 @@ open class Obj {
         }
 
 
+        @Suppress("NOTHING_TO_INLINE")
         inline fun from(obj: Any?): Obj {
             @Suppress("UNCHECKED_CAST")
             return when (obj) {
diff --git a/lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjBitBuffer.kt b/lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjBitBuffer.kt
index 0f7a9c8..6389808 100644
--- a/lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjBitBuffer.kt
+++ b/lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjBitBuffer.kt
@@ -35,12 +35,12 @@ class ObjBitBuffer(val bitArray: BitArray) : Obj() {
         }.apply {
             addFn("toBuffer") {
                 requireNoArgs()
-                ObjBuffer(thisAs<ObjBitBuffer>().bitArray.asUbyteArray())
+                ObjBuffer(thisAs<ObjBitBuffer>().bitArray.asUByteArray())
             }
             addFn("toDump") {
                 requireNoArgs()
                 ObjString(
-                    thisAs<ObjBitBuffer>().bitArray.asUbyteArray().toDump()
+                    thisAs<ObjBitBuffer>().bitArray.asUByteArray().toDump()
                 )
             }
             addFn("size") {
diff --git a/lynglib/src/commonMain/kotlin/net/sergeych/lynon/BitList.kt b/lynglib/src/commonMain/kotlin/net/sergeych/lynon/BitList.kt
index 8900b12..7940920 100644
--- a/lynglib/src/commonMain/kotlin/net/sergeych/lynon/BitList.kt
+++ b/lynglib/src/commonMain/kotlin/net/sergeych/lynon/BitList.kt
@@ -17,8 +17,10 @@
 
 package net.sergeych.lynon
 
+import kotlin.math.min
+
 @Suppress("unused")
-interface BitList {
+interface BitList: Comparable<BitList> {
     operator fun get(bitIndex: Long): Int
     operator fun set(bitIndex: Long,value: Int)
     val size: Long
@@ -31,6 +33,22 @@ interface BitList {
             if( index < size) this@BitList[index++]
             else null
     }
+
+    override fun compareTo(other: BitList): Int {
+        val m = min(size, other.size)
+        for( i in 0 ..< m) {
+            val a = this[i]
+            val b = other[i]
+            when {
+                a < b -> return -1
+                a > b -> return 1
+            }
+        }
+        if( size > other.size) return 1
+        if( size < other.size) return -1
+        return 0
+    }
+
 }
 
 fun bitListOf(vararg bits: Int): BitList {
diff --git a/lynglib/src/commonMain/kotlin/net/sergeych/lynon/MemoryBitOutput.kt b/lynglib/src/commonMain/kotlin/net/sergeych/lynon/MemoryBitOutput.kt
index 4c914ce..7dd8080 100644
--- a/lynglib/src/commonMain/kotlin/net/sergeych/lynon/MemoryBitOutput.kt
+++ b/lynglib/src/commonMain/kotlin/net/sergeych/lynon/MemoryBitOutput.kt
@@ -17,13 +17,18 @@
 
 package net.sergeych.lynon
 
+import kotlinx.serialization.Serializable
 import kotlin.math.min
 
 /**
  * BitList implementation as fixed suze array of bits; indexing works exactly same as if
  * [MemoryBitInput] is used with [MemoryBitInput.getBit]. See [MemoryBitOutput] for
  * bits order and more information.
+ *
+ * It is [BitList] - comparable, and provides valid [hashCode] and [equals], so it could
+ * also be used as a key in maps.
  */
+@Serializable
 class BitArray(val bytes: UByteArray, val lastByteBits: Int) : BitList {
 
     val bytesSize: Int get() = bytes.size
@@ -73,7 +78,15 @@ class BitArray(val bytes: UByteArray, val lastByteBits: Int) : BitList {
     fun asByteArray(): ByteArray = bytes.asByteArray()
 
     @Suppress("unused")
-    fun asUbyteArray(): UByteArray = bytes
+    fun asUByteArray(): UByteArray = bytes
+
+    override fun equals(other: Any?): Boolean {
+        return other is BitList && this.compareTo(other) == 0
+    }
+
+    override fun hashCode(): Int {
+        return bytes.contentHashCode()
+    }
 
     companion object {
 
diff --git a/lynglib/src/commonMain/kotlin/net/sergeych/lynon/huffman.kt b/lynglib/src/commonMain/kotlin/net/sergeych/lynon/huffman.kt
index bdf840f..138e26c 100644
--- a/lynglib/src/commonMain/kotlin/net/sergeych/lynon/huffman.kt
+++ b/lynglib/src/commonMain/kotlin/net/sergeych/lynon/huffman.kt
@@ -18,7 +18,6 @@
 package net.sergeych.lynon
 
 import net.sergeych.collections.SortedList
-import net.sergeych.lynon.Huffman.Alphabet
 
 
 /**
@@ -285,7 +284,7 @@ object Huffman {
 
     fun <T>decompress(bin: BitInput,alphabet: Alphabet<T>): UByteArray {
         val codes = deserializeCanonicCodes(bin, alphabet)
-        return decompressUsingCodes(bin, codes, alphabet).asUbyteArray()
+        return decompressUsingCodes(bin, codes, alphabet).asUByteArray()
     }
 
 }
\ No newline at end of file
diff --git a/lynglib/src/commonMain/kotlin/net/sergeych/lynon/packer.kt b/lynglib/src/commonMain/kotlin/net/sergeych/lynon/packer.kt
index d849efa..2aa54ad 100644
--- a/lynglib/src/commonMain/kotlin/net/sergeych/lynon/packer.kt
+++ b/lynglib/src/commonMain/kotlin/net/sergeych/lynon/packer.kt
@@ -56,7 +56,7 @@ object ObjLynonClass : ObjClass("Lynon") {
 @Suppress("unused")
 suspend fun lynonEncodeAny(scope: Scope, value: Obj): UByteArray =
     (ObjLynonClass.encodeAny(scope, value))
-        .bitArray.asUbyteArray()
+        .bitArray.asUByteArray()
 
 @Suppress("unused")
 suspend fun lynonDecodeAny(scope: Scope, encoded: UByteArray): Obj =
diff --git a/lynglib/src/jvmTest/kotlin/OtherTests.kt b/lynglib/src/jvmTest/kotlin/OtherTests.kt
index f2e9c6b..66fc8ce 100644
--- a/lynglib/src/jvmTest/kotlin/OtherTests.kt
+++ b/lynglib/src/jvmTest/kotlin/OtherTests.kt
@@ -22,7 +22,10 @@ import net.sergeych.lyng.Source
 import net.sergeych.lyng.eval
 import net.sergeych.lyng.pacman.InlineSourcesImportProvider
 import net.sergeych.lyng.toSource
+import net.sergeych.lynon.BitArray
+import net.sergeych.lynon.BitList
 import kotlin.test.Test
+import kotlin.test.assertNotEquals
 
 class OtherTests {
     @Test
@@ -67,4 +70,33 @@ class OtherTests {
         Unit
     }
 
+    @Test
+    fun testBitArrayEqAndHash() {
+
+        val b1 = BitArray.ofBits(1, 0, 1, 1)
+        val b11 = BitArray.ofBits(1, 0, 1, 1)
+        val b2 = BitArray.ofBits(1, 1, 1, 1)
+        val b3 = BitArray.ofBits(1, 0, 1, 1, 0)
+
+        assert( b3 > b1 )
+        assert( b2 > b1)
+        assert( b11.compareTo(b1) == 0)
+
+        assertEquals(b1, b11)
+        assertNotEquals(b1, b2)
+        assertNotEquals(b1, b3)
+
+        assert( b1.hashCode() == b11.hashCode() )
+
+        val x = mutableMapOf<BitList,String>()
+        x[b1] = "wrong"
+        x[b11] = "OK"
+        x[b2] = "other"
+
+        assertEquals("OK", x[b11])
+        assertEquals("OK", x[b1])
+        assertEquals("other", x[b2])
+
+    }
+
 }
\ No newline at end of file