"cache" bug found and fixed, causing some improvemts in lambda processing.

lynglib/src/commonMain/kotlin/net/sergeych/lyng/Compiler.kt

@@ -628,35 +628,30 @@ class Compiler(
 
         val body = parseBlock(skipLeadingBrace = true)
 
-        var closure: Scope? = null
-
-        val callStatement = statement {
-            // and the source closure of the lambda which might have other thisObj.
-            val context = this.applyClosure(closure!!)
-            // Execute lambda body in a closure-aware context. Blocks inside the lambda
-            // will create child scopes as usual, so re-declarations inside loops work.
-            if (argsDeclaration == null) {
-                // no args: automatic var 'it'
-                val l = args.list
-                val itValue: Obj = when (l.size) {
-                    // no args: it == void
-                    0 -> ObjVoid
-                    // one args: it is this arg
-                    1 -> l[0]
-                    // more args: it is a list of args
-                    else -> ObjList(l.toMutableList())
+        return ValueFnRef { closureScope ->
+            statement {
+                // and the source closure of the lambda which might have other thisObj.
+                val context = this.applyClosure(closureScope)
+                // Execute lambda body in a closure-aware context. Blocks inside the lambda
+                // will create child scopes as usual, so re-declarations inside loops work.
+                if (argsDeclaration == null) {
+                    // no args: automatic var 'it'
+                    val l = args.list
+                    val itValue: Obj = when (l.size) {
+                        // no args: it == void
+                        0 -> ObjVoid
+                        // one args: it is this arg
+                        1 -> l[0]
+                        // more args: it is a list of args
+                        else -> ObjList(l.toMutableList())
+                    }
+                    context.addItem("it", false, itValue, recordType = ObjRecord.Type.Argument)
+                } else {
+                    // assign vars as declared the standard way
+                    argsDeclaration.assignToContext(context, defaultAccessType = AccessType.Val)
                 }
-                context.addItem("it", false, itValue, recordType = ObjRecord.Type.Argument)
-            } else {
-                // assign vars as declared the standard way
-                argsDeclaration.assignToContext(context, defaultAccessType = AccessType.Val)
-            }
-            body.execute(context)
-        }
-
-        return ValueFnRef { x ->
-            closure = x
-            callStatement.asReadonly
+                body.execute(context)
+            }.asReadonly
         }
     }
 

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjInstance.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2025 Sergey S. Chernov real.sergeych@gmail.com
+ * Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -271,7 +271,7 @@ class ObjInstance(override val objClass: ObjClass) : Obj() {
 
     protected val comparableVars: Map<String, ObjRecord> by lazy {
         instanceScope.objects.filter {
-            it.value.type.comparable
+            it.value.type.comparable && (it.value.type != ObjRecord.Type.Field || it.value.isMutable)
         }
     }
 

lynglib/src/commonMain/kotlin/net/sergeych/lyng/statements.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2025 Sergey S. Chernov real.sergeych@gmail.com
+ * Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,7 +19,6 @@ package net.sergeych.lyng
 
 import net.sergeych.lyng.obj.Obj
 import net.sergeych.lyng.obj.ObjClass
-import net.sergeych.lyng.obj.ObjNull
 import net.sergeych.lyng.obj.ObjVoid
 
 fun String.toSource(name: String = "eval"): Source = Source(name, this)
@@ -46,9 +45,8 @@ abstract class Statement(
     abstract suspend fun execute(scope: Scope): Obj
 
     override suspend fun compareTo(scope: Scope, other: Obj): Int {
-        if( other == ObjNull || other == ObjVoid ) return 1
         if( other === this ) return 0
-        return -1
+        return -3
     }
 
     override suspend fun callOn(scope: Scope): Obj {