diff --git a/CodeGen.pm b/CodeGen.pm
index d3074a2c..bedfd3ac 100644
--- a/CodeGen.pm
+++ b/CodeGen.pm
@@ -253,7 +253,8 @@ use 5.010;
 
     sub string_var {
         my ($self, $text) = @_;
-        $self->_push("Variable", "Kernel.NewROVar(new CLRImportObject(" . qm($text) . "))");
+        $self->clr_string($text);
+        $self->box('Str');
     }
 
     sub how {
@@ -367,7 +368,6 @@ use 5.010;
 
     sub unbox {
         my ($self, $ty) = @_;
-        $self->fetch;
         $self->clr_call_direct('Kernel.UnboxAny', 1);
         $self->cast($ty);
     }
diff --git a/Decl.pm b/Decl.pm
index f901aa95..1b1adee6 100644
--- a/Decl.pm
+++ b/Decl.pm
@@ -140,7 +140,8 @@ use 5.010;
         }
         $cg->scopelexget("ClassHOW", $body);
         $cg->dup_fetch;
-        $cg->string_var($self->name // 'ANON');
+        $cg->clr_string($self->name // 'ANON');
+        $cg->clr_wrap;
         $cg->call_method(1, "new", 1);
         $cg->push_aux('how');
         $cg->peek_aux('how');
diff --git a/Niecza/Actions.pm b/Niecza/Actions.pm
index cb49d3a3..1ca62fbc 100644
--- a/Niecza/Actions.pm
+++ b/Niecza/Actions.pm
@@ -402,6 +402,14 @@ sub insn__S_unwrap { my ($cl, $M) = @_;
     $M->{_ast} = [[ clr_unwrap => $M->{clrid}->Str ]];
 }
 
+sub insn__S_box { my ($cl, $M) = @_;
+    $M->{_ast} = [[ box => $M->{varid}->Str ]];
+}
+
+sub insn__S_unbox { my ($cl, $M) = @_;
+    $M->{_ast} = [[ unbox => $M->{clrid}->Str ]];
+}
+
 sub insn__S_clr_sfield_get { my ($cl, $M) = @_;
     $M->{_ast} = [[ clr_sfield_get => $M->{clrid}->Str ]];
 }
diff --git a/Niecza/Grammar.pm6 b/Niecza/Grammar.pm6
index b519ce85..18d3ec35 100644
--- a/Niecza/Grammar.pm6
+++ b/Niecza/Grammar.pm6
@@ -69,6 +69,8 @@ grammar NIL is STD {
     token insn:tail_call_sub { '.tailcall/' {} <decint> }
     token insn:unwrap { <sym> ':' {} <clrid> }
     token insn:new { <sym> '/' {} <decint> ':' <clrid> }
+    token insn:box { <sym> ':' {} <varid> }
+    token insn:unbox { <sym> ':' {} <clrid> }
     token insn:clr_field_get { '@.' {} <varid> }
     token insn:clr_field_set { '!.' {} <varid> }
     token insn:clr_index_get { '@[' {} <varid>? ']' }
@@ -86,3 +88,5 @@ grammar NIL is STD {
 }
 
 }
+
+# vim: ft=
diff --git a/setting b/setting
index 7c3f3381..4915ff27 100644
--- a/setting
+++ b/setting
@@ -121,16 +121,17 @@ PRE-INIT {
         L@$ch @.slots L@$chpmo wrap ![meta-object]
 
         L@&push-scope @  L@$ch wrapobj  callframe wrap  .call/2:v
-        L@&add-scoped-method @  L@$ch wrapobj  ="new"  0 wrap  L@&new  .call/4:v
-        L@&add-scoped-method @  L@$ch wrapobj  ="push-scope"  0 wrap
+        L@&add-scoped-method @  L@$ch wrapobj  "new" wrap  0 wrap
+            L@&new  .call/4:v
+        L@&add-scoped-method @  L@$ch wrapobj  "push-scope" wrap  0 wrap
             L@&push-scope  .call/4:v
-        L@&add-scoped-method @  L@$ch wrapobj  ="add-scoped-method"  0 wrap
+        L@&add-scoped-method @  L@$ch wrapobj  "add-scoped-method" wrap  0 wrap
             L@&add-scoped-method  .call/4:v
-        L@&add-scoped-method @  L@$ch wrapobj  ="add-super"  0 wrap
+        L@&add-scoped-method @  L@$ch wrapobj  "add-super" wrap  0 wrap
             L@&add-super  .call/4:v
-        L@&add-scoped-method @  L@$ch wrapobj  ="compose"  0 wrap
+        L@&add-scoped-method @  L@$ch wrapobj  "compose" wrap  0 wrap
             L@&compose  .call/4:v
-        L@&add-scoped-method @  L@$ch wrapobj  ="create-protoobject"  0 wrap
+        L@&add-scoped-method @  L@$ch wrapobj  "create-protoobject" wrap  0 wrap
             L@&create-protoobject  .call/4:v
 
         L@&create-protoobject @  L@$ch wrapobj  callframe wrap
@@ -154,7 +155,7 @@ PRE-INIT {
     # (DynProtoMetaObject $dpmo, ClassHOW $super --> ClassHOW)
     sub wrap-dpmo { Q:NIL {
         LEXICALS: $ch : Variable, $dp : DynProtoMetaObject
-        L@^^ClassHOW dup@  ="" .method/1:new  L!$ch
+        L@^^ClassHOW dup@  "" wrap .method/1:new  L!$ch
         =[0] @ unwrap:DynProtoMetaObject L!$dp
         L@$ch @  L@$dp wrap @  !!meta-object
         L@$ch dup@  =[1]  .method/1:add-super:v
@@ -182,19 +183,19 @@ PRE-INIT {
 
 Q:NIL {
     LEXICALS: $plist : List<DynMetaObject>
-    L@^ClassHOW dup@  ="Mu"  .method/1:new  L!^'Mu!HOW'
+    L@^ClassHOW dup@  "Mu" wrap  .method/1:new  L!^'Mu!HOW'
     new/0:List<DynMetaObject> L!$plist
     L@^'Mu!HOW' dup@  callframe wrap  L@$plist wrap
         .method/2:create-protoobject  L!^Mu
 
-    L@^ClassHOW dup@  ="Any"  .method/1:new  L!^'Any!HOW'
+    L@^ClassHOW dup@  "Any" wrap  .method/1:new  L!^'Any!HOW'
     L@^'Any!HOW' dup@  L@^'Mu!HOW'  .method/1:add-super:v
     new/0:List<DynMetaObject> L!$plist
     L@$plist  L@^Mu @ cast:DynObject @.klass  .virtcall/1:Add
     L@^'Any!HOW' dup@  callframe wrap  L@$plist wrap
         .method/2:create-protoobject  L!^Any
 
-    L@^ClassHOW dup@  ="Any"  .method/1:new  L!^'Cool!HOW'
+    L@^ClassHOW dup@  "Cool" wrap  .method/1:new  L!^'Cool!HOW'
     L@^'Cool!HOW' dup@  L@^'Any!HOW'  .method/1:add-super:v
     new/0:List<DynMetaObject> L!$plist
     L@$plist  L@^Any @ cast:DynObject @.klass  .virtcall/1:Add
@@ -215,17 +216,17 @@ Q:NIL {
 } }
 
 sub infix:<~> { Q:NIL {
-    =[0] @ unwrap:String  =[1] @ unwrap:String  .plaincall/2:String.Concat
-        wrap
+    =[0] @ unbox:String  =[1] @ unbox:String  .plaincall/2:String.Concat
+        box:Str
 } }
 
 sub say { Q:NIL {
-    =[0] @ unwrap:String .plaincall/1:Console.WriteLine null:Variable
+    =[0] @ unbox:String .plaincall/1:Console.WriteLine null:Variable
 } }
 
 my class Junction is Mu { }
 my class Num { }
-#my class Str { }
+my class Str { }
 my class Blob { }
 my class Char { }
 my class CharLingua { }