diff --git a/codeGenCpu6502/src/prog8/codegen/cpu6502/assignment/AssignmentAsmGen.kt b/codeGenCpu6502/src/prog8/codegen/cpu6502/assignment/AssignmentAsmGen.kt
index e1ce880b0..b86b41b74 100644
--- a/codeGenCpu6502/src/prog8/codegen/cpu6502/assignment/AssignmentAsmGen.kt
+++ b/codeGenCpu6502/src/prog8/codegen/cpu6502/assignment/AssignmentAsmGen.kt
@@ -873,20 +873,20 @@ internal class AssignmentAsmGen(private val program: Program,
                 throw AssemblyError("containment check of floats not supported")
             }
             DataType.ARRAY_B, DataType.ARRAY_UB -> {
-                val arrayVal = variable.value as ArrayLiteral
+                val numElements = variable.arraysize!!.constIndex()!!
                 assignExpressionToRegister(containment.element, RegisterOrPair.A, elementDt istype DataType.BYTE)
                 asmgen.saveRegisterLocal(CpuRegister.A, containment.definingSubroutine!!)
                 assignAddressOf(AsmAssignTarget(TargetStorageKind.VARIABLE, asmgen, DataType.UWORD, containment.definingSubroutine, "P8ZP_SCRATCH_W1"), varname)
                 asmgen.restoreRegisterLocal(CpuRegister.A)
-                asmgen.out("  ldy  #${arrayVal.value.size}")
+                asmgen.out("  ldy  #$numElements")
                 asmgen.out("  jsr  prog8_lib.containment_bytearray")
                 return
             }
             DataType.ARRAY_W, DataType.ARRAY_UW -> {
-                val arrayVal = variable.value as ArrayLiteral
+                val numElements = variable.arraysize!!.constIndex()!!
                 assignExpressionToVariable(containment.element, "P8ZP_SCRATCH_W1", elementDt.getOr(DataType.UNDEFINED), containment.definingSubroutine)
                 assignAddressOf(AsmAssignTarget(TargetStorageKind.VARIABLE, asmgen, DataType.UWORD, containment.definingSubroutine, "P8ZP_SCRATCH_W2"), varname)
-                asmgen.out("  ldy  #${arrayVal.value.size}")
+                asmgen.out("  ldy  #$numElements")
                 asmgen.out("  jsr  prog8_lib.containment_wordarray")
                 return
             }
@@ -1005,7 +1005,7 @@ internal class AssignmentAsmGen(private val program: Program,
             }
         }
 
-        if(valueDt==DataType.UBYTE) {
+        if(valueDt==DataType.UBYTE || valueDt==DataType.BOOL) {
             when(target.register) {
                 RegisterOrPair.A,
                 RegisterOrPair.X,
@@ -1069,8 +1069,10 @@ internal class AssignmentAsmGen(private val program: Program,
             }
         }
 
-        if(targetDt in IntegerDatatypes && valueDt in IntegerDatatypes && valueDt.isAssignableTo(targetDt)) {
-            require(targetDt in WordDatatypes && valueDt in ByteDatatypes) { "should be byte to word assignment ${origTypeCastExpression.position}"}
+        if(targetDt in IntegerDatatypes && valueDt in IntegerDatatypes && valueDt!=targetDt && valueDt.isAssignableTo(targetDt)) {
+            require(targetDt in WordDatatypes && valueDt in ByteDatatypes) {
+                "should be byte to word assignment ${origTypeCastExpression.position}"
+            }
             when(target.kind) {
 //                TargetStorageKind.VARIABLE -> {
 //                    This has been handled already earlier on line 961.
@@ -1136,13 +1138,12 @@ internal class AssignmentAsmGen(private val program: Program,
                 asmgen.out("  jsr floats.MOVEF")
             }
             return
-        } else {
-            // No more special optmized cases yet. Do the rest via more complex evaluation
-            // note: cannot use assignTypeCastedValue because that is ourselves :P
-            // NOTE: THIS MAY TURN INTO A STACK OVERFLOW ERROR IF IT CAN'T SIMPLIFY THE TYPECAST..... :-/
-            asmgen.assignExpressionTo(origTypeCastExpression, target)
-            return
         }
+
+        // No more special optmized cases yet. Do the rest via more complex evaluation
+        // note: cannot use assignTypeCastedValue because that is ourselves :P
+        // NOTE: THIS MAY TURN INTO A STACK OVERFLOW ERROR IF IT CAN'T SIMPLIFY THE TYPECAST..... :-/
+        asmgen.assignExpressionTo(origTypeCastExpression, target)
     }
 
     private fun assignCastViaLsbFunc(value: Expression, target: AsmAssignTarget) {
diff --git a/compiler/src/prog8/compiler/astprocessing/AstChecker.kt b/compiler/src/prog8/compiler/astprocessing/AstChecker.kt
index 7559716c5..8c6d20915 100644
--- a/compiler/src/prog8/compiler/astprocessing/AstChecker.kt
+++ b/compiler/src/prog8/compiler/astprocessing/AstChecker.kt
@@ -7,6 +7,7 @@ import prog8.ast.expressions.*
 import prog8.ast.statements.*
 import prog8.ast.walk.IAstVisitor
 import prog8.code.core.*
+import prog8.code.target.VMTarget
 import prog8.compiler.BuiltinFunctions
 import prog8.compiler.InplaceModifyingBuiltinFunctions
 import prog8.compiler.builtinFunctionReturnType
@@ -1259,8 +1260,14 @@ internal class AstChecker(private val program: Program,
         val elementDt = containment.element.inferType(program)
         val iterableDt = containment.iterable.inferType(program)
 
-        if(containment.parent is BinaryExpression)
-            errors.err("containment check is currently not supported inside complex expressions", containment.position)
+        if(compilerOptions.compTarget.name!=VMTarget.NAME) {
+            val parentBinexpr = containment.parent as? BinaryExpression
+            if(parentBinexpr!=null) {
+                // only supported if compared to 1 or 0, more complex expressions aren't supported in the 6502 code-gen.
+                if(parentBinexpr.operator!="==" || parentBinexpr.right.constValue(program)?.number !in listOf(0.0, 1.0))
+                    errors.err("containment check is currently not supported inside complex expressions", containment.position)
+            }
+        }
 
         if(iterableDt.isIterable && containment.iterable !is RangeExpression) {
             val iterableEltDt = ArrayToElementTypes.getValue(iterableDt.getOr(DataType.UNDEFINED))
diff --git a/compiler/src/prog8/compiler/astprocessing/VariousCleanups.kt b/compiler/src/prog8/compiler/astprocessing/VariousCleanups.kt
index 90b47f150..86cea5abb 100644
--- a/compiler/src/prog8/compiler/astprocessing/VariousCleanups.kt
+++ b/compiler/src/prog8/compiler/astprocessing/VariousCleanups.kt
@@ -6,10 +6,7 @@ import prog8.ast.Node
 import prog8.ast.Program
 import prog8.ast.base.FatalAstException
 import prog8.ast.expressions.*
-import prog8.ast.statements.AnonymousScope
-import prog8.ast.statements.Assignment
-import prog8.ast.statements.ConditionalBranch
-import prog8.ast.statements.IfElse
+import prog8.ast.statements.*
 import prog8.ast.walk.AstWalker
 import prog8.ast.walk.IAstModification
 import prog8.code.core.*
@@ -175,6 +172,19 @@ internal class VariousCleanups(val program: Program, val errors: IErrorReporter,
             return noModifications
         }
 
+        fun checkArray(variable: VarDecl): Iterable<IAstModification> {
+            return if(variable.value==null) {
+                val arraySpec = variable.arraysize!!
+                val size = arraySpec.indexExpr.constValue(program)?.number?.toInt() ?: throw FatalAstException("no array size")
+                return if(size==0)
+                    replaceWithFalse()
+                else
+                    noModifications
+            }
+            else
+                checkArray((variable.value as ArrayLiteral).value)
+        }
+
         fun checkString(stringVal: StringLiteral): Iterable<IAstModification> {
             if(stringVal.value.isEmpty())
                 return replaceWithFalse()
@@ -198,8 +208,7 @@ internal class VariousCleanups(val program: Program, val errors: IErrorReporter,
                         return checkString(stringVal)
                     }
                     in ArrayDatatypes -> {
-                        val array = (variable.value as ArrayLiteral).value
-                        return checkArray(array)
+                        return checkArray(variable)
                     }
                     else -> {}
                 }
diff --git a/compiler/test/codegeneration/TestVarious.kt b/compiler/test/codegeneration/TestVarious.kt
new file mode 100644
index 000000000..785d2f066
--- /dev/null
+++ b/compiler/test/codegeneration/TestVarious.kt
@@ -0,0 +1,22 @@
+package prog8tests.codegeneration
+
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.shouldNotBe
+import prog8.code.target.C64Target
+import prog8tests.helpers.compileText
+
+class TestVarious: FunSpec({
+    test("bool to byte cast in expression is correct") {
+        val text="""
+main {
+    sub start() {
+        ubyte[3] values
+        func(33 + (22 in values))
+    }
+    sub func(ubyte arg) {
+        arg++
+    }
+}"""
+        compileText(C64Target(), false, text, writeAssembly = true) shouldNotBe null
+    }
+})
\ No newline at end of file
diff --git a/compiler/test/vm/TestCompilerVirtual.kt b/compiler/test/vm/TestCompilerVirtual.kt
index 09e5f98ed..06007a04a 100644
--- a/compiler/test/vm/TestCompilerVirtual.kt
+++ b/compiler/test/vm/TestCompilerVirtual.kt
@@ -327,4 +327,19 @@ main {
         instructions.size shouldBe 18
         instructions.last().opcode shouldBe Opcode.RETURN
     }
+
+    test("compile virtual: various expressions") {
+        val text="""
+main {
+    sub start() {
+        ubyte[3] values = [1,2,3]
+        func(33 + (22 in values))   ; bool cast to byte
+        func(values[cx16.r0L] + (22 in values))  ; containment in complex expression
+    }
+    sub func(ubyte arg) {
+        arg++
+    }
+}"""
+        compileText(VMTarget(), false, text, writeAssembly = true) shouldNotBe null
+    }
 })
\ No newline at end of file
diff --git a/docs/source/todo.rst b/docs/source/todo.rst
index 83e447960..c40079012 100644
--- a/docs/source/todo.rst
+++ b/docs/source/todo.rst
@@ -3,12 +3,12 @@ TODO
 
 For next release
 ^^^^^^^^^^^^^^^^
-- bool bb = not bb -> larger code than bool bb ^= 1
-- bool xx = ~xx -> larger code than xx ^= 1
-- ubyte xx = not xx  -> much larger code than xx ^= 1
-- try to support "not (xx in array)"  or maybe even  "xx not in array"
-- astchecker: "containment check is currently not supported inside complex expressions" fix this?
-  or at least disable this check for virtual target?
+- allow "xx not in array" and rewrite it into "not xx in array"
+- make sure bool value is always 0 or 1 (all casts should convert), then:
+    - rewrite bool=bool^1 into bool=not bool
+    - should solve: bool bb = not bb -> larger code than bool bb ^= 1
+    - should solve: bool xx = ~xx -> larger code than xx ^= 1
+
 
 ...