diff --git a/docs/samples/happy_numbers.lyng b/docs/samples/happy_numbers.lyng
index 1c8cedb..2bada4b 100644
--- a/docs/samples/happy_numbers.lyng
+++ b/docs/samples/happy_numbers.lyng
@@ -16,6 +16,9 @@ fun naiveCountHappyNumbers() {
     count
 }
 
+//
+// After all optimizations it takes ~120ms.
+//
 val found = naiveCountHappyNumbers()
 println("Found happy numbers: "+found)
-assert( found == 55252 )
+assert( found == 55252 )
\ No newline at end of file
diff --git a/library/src/commonMain/kotlin/net/sergeych/lyng/Compiler.kt b/library/src/commonMain/kotlin/net/sergeych/lyng/Compiler.kt
index 5a9973c..347f93f 100644
--- a/library/src/commonMain/kotlin/net/sergeych/lyng/Compiler.kt
+++ b/library/src/commonMain/kotlin/net/sergeych/lyng/Compiler.kt
@@ -749,9 +749,9 @@ class Compiler(
         var result: Obj = ObjVoid
         val iVar = ObjInt(0)
         loopVar.value = iVar
-        for( i in start ..< end) {
-            iVar.value = i.toLong()
-            if (catchBreak)
+        if( catchBreak) {
+            for (i in start..<end) {
+                iVar.value = i.toLong()
                 try {
                     result = body.execute(forContext)
                 } catch (lbe: LoopBreakContinueException) {
@@ -760,7 +760,10 @@ class Compiler(
                     }
                     return lbe.result
                 }
-            else {
+            }
+        } else {
+            for (i in start.toLong()..<end.toLong()) {
+                iVar.value = i
                 result = body.execute(forContext)
             }
         }
@@ -1181,6 +1184,8 @@ class Compiler(
             Operator.simple(Token.Type.IS, lastPrty) { c, a, b -> ObjBool(a.isInstanceOf(b)) },
             Operator.simple(Token.Type.NOTIS, lastPrty) { c, a, b -> ObjBool(!a.isInstanceOf(b)) },
             // shuttle <=> 6
+            Operator.simple(Token.Type.SHUTTLE, ++lastPrty) { c, a, b ->
+                ObjInt(a.compareTo(c, b).toLong()) },
             // bit shifts 7
             Operator.simple(Token.Type.PLUS, ++lastPrty) { ctx, a, b -> a.plus(ctx, b) },
             Operator.simple(Token.Type.MINUS, lastPrty) { ctx, a, b -> a.minus(ctx, b) },
diff --git a/library/src/commonMain/kotlin/net/sergeych/lyng/Parser.kt b/library/src/commonMain/kotlin/net/sergeych/lyng/Parser.kt
index 20f8903..d813038 100644
--- a/library/src/commonMain/kotlin/net/sergeych/lyng/Parser.kt
+++ b/library/src/commonMain/kotlin/net/sergeych/lyng/Parser.kt
@@ -153,7 +153,13 @@ private class Parser(fromPos: Pos) {
             '<' -> {
                 if (currentChar == '=') {
                     pos.advance()
-                    Token("<=", from, Token.Type.LTE)
+                    if( currentChar == '>' ) {
+                        pos.advance()
+                        Token("<=>", from, Token.Type.SHUTTLE)
+                    }
+                    else {
+                        Token("<=", from, Token.Type.LTE)
+                    }
                 } else
                     Token("<", from, Token.Type.LT)
             }
diff --git a/library/src/commonMain/kotlin/net/sergeych/lyng/Token.kt b/library/src/commonMain/kotlin/net/sergeych/lyng/Token.kt
index 556a47d..75fa942 100644
--- a/library/src/commonMain/kotlin/net/sergeych/lyng/Token.kt
+++ b/library/src/commonMain/kotlin/net/sergeych/lyng/Token.kt
@@ -13,6 +13,7 @@ data class Token(val value: String, val pos: Pos, val type: Type) {
         PLUS2, MINUS2,
         IN, NOTIN, IS, NOTIS,
         EQ, NEQ, LT, LTE, GT, GTE, REF_EQ, REF_NEQ,
+        SHUTTLE,
         AND, BITAND, OR, BITOR, NOT, BITNOT, DOT, ARROW, QUESTION, COLONCOLON,
         SINLGE_LINE_COMMENT, MULTILINE_COMMENT,
         LABEL, ATLABEL, // label@ at@label
diff --git a/library/src/commonTest/kotlin/ScriptTest.kt b/library/src/commonTest/kotlin/ScriptTest.kt
index 8e76856..c495862 100644
--- a/library/src/commonTest/kotlin/ScriptTest.kt
+++ b/library/src/commonTest/kotlin/ScriptTest.kt
@@ -1192,6 +1192,52 @@ class ScriptTest {
         fna(5,6)
         """
         )
+    }
+
+    @Test
+    fun testSpoilLamdaArgsBug() = runTest {
+        eval(
+            """
+        val fnb = { a,b -> a + b }
+        
+         val fna = { a, b ->
+            val a0 = a
+            val b0 = b
+            fnb(a + 1, b + 1)
+            assert( a0 == a )
+            assert( b0 == b )
+        }
+       
+        fna(5,6)
+        """
+        )
+    }
+
+    @Test
+    fun commentBlocksShouldNotAlterBehavior() = runTest {
+        eval(
+            """
+            fun test() {    
+                10
+                /*
+                */
+                //val x = 11
+            }
+            assert( test() == 10 )
+        """.trimIndent()
+        )
+    }
+
+    @Test
+    fun testShuttle() = runTest {
+        eval(
+            """
+            assert( 5 <=> 3 > 0 )
+            assert( 0 < 5 <=> 3  )
+            assert( 5 <=> 5 == 0 )
+            assert( 5 <=> 7 < 0 )
+        """.trimIndent()
+        )
 
     }
 }
\ No newline at end of file
diff --git a/library/src/jvmTest/kotlin/SamplesTest.kt b/library/src/jvmTest/kotlin/SamplesTest.kt
index 2ab11ac..1165242 100644
--- a/library/src/jvmTest/kotlin/SamplesTest.kt
+++ b/library/src/jvmTest/kotlin/SamplesTest.kt
@@ -14,13 +14,12 @@ suspend fun executeSampleTests(fileName: String) {
     }
     runBlocking {
         val c = Context()
-        for( i in 1..1) {
             val start = Clock.System.now()
             c.eval(sample)
             val time = Clock.System.now() - start
             println("$time: $fileName")
 //            delay(100)
-        }
+//        }
     }
 }