diff --git a/kern/dict-type.go b/kern/dict-type.go
index dd2bb5f..a1d87b8 100644
--- a/kern/dict-type.go
+++ b/kern/dict-type.go
@@ -76,9 +76,11 @@ func (dict *DictType) toMultiLine(sb *strings.Builder, opt FmtOpt) {
 
 			sb.WriteString(nest)
 			if key, ok := name.(string); ok {
-				sb.WriteString(string('"') + key + string('"'))
+				sb.WriteByte('"')
+				sb.WriteString(key)
+				sb.WriteByte('"')
 			} else {
-				sb.WriteString(fmt.Sprintf("%v", name))
+				fmt.Fprintf(sb, "%v", name)
 			}
 			sb.WriteString(": ")
 			if f, ok := value.(Formatter); ok {
@@ -86,7 +88,7 @@ func (dict *DictType) toMultiLine(sb *strings.Builder, opt FmtOpt) {
 			} else if _, ok = value.(Functor); ok {
 				sb.WriteString("func(){}")
 			} else {
-				sb.WriteString(fmt.Sprintf("%v", value))
+				fmt.Fprintf(sb, "%v", value)
 			}
 		}
 		sb.WriteByte('\n')
@@ -110,9 +112,11 @@ func (dict *DictType) ToString(opt FmtOpt) string {
 				sb.WriteString(", ")
 			}
 			if s, ok := key.(string); ok {
-				sb.WriteString(string('"') + s + string('"'))
+				sb.WriteByte('"')
+				sb.WriteString(s)
+				sb.WriteByte('"')
 			} else {
-				sb.WriteString(fmt.Sprintf("%v", key))
+				fmt.Fprintf(&sb, "%v", key)
 			}
 			sb.WriteString(": ")
 			if formatter, ok := value.(Formatter); ok {
@@ -120,7 +124,7 @@ func (dict *DictType) ToString(opt FmtOpt) string {
 			} else if t, ok := value.(Term); ok {
 				sb.WriteString(t.String())
 			} else {
-				sb.WriteString(fmt.Sprintf("%#v", value))
+				fmt.Fprintf(&sb, "%#v", value)
 			}
 		}
 		sb.WriteByte('}')
diff --git a/kern/expr-context.go b/kern/expr-context.go
index a5d7f95..88e8f21 100644
--- a/kern/expr-context.go
+++ b/kern/expr-context.go
@@ -28,4 +28,36 @@ type ExprContext interface {
 	Call(name string, args map[string]any) (result any, err error)
 	RegisterFuncInfo(info ExprFunc)
 	RegisterFunc(name string, f Functor, returnType string, param []ExprFuncParam) (funcInfo ExprFunc, err error)
+
+	ToDict() (dict *DictType)
+	ToString(opt FmtOpt) string
+}
+
+func ContextToDict(ctx ExprContext) (dict *DictType) {
+	var keys []string
+	// Variables
+	keys = ctx.EnumVars(nil)
+	vars := MakeDict()
+	for _, key := range keys {
+		value, _ := ctx.GetVar(key)
+		vars.SetItem(key, value)
+	}
+
+	// Functions
+	keys = ctx.EnumFuncs(func(name string) bool { return true })
+	funcs := MakeDict()
+	for _, key := range keys {
+		funcInfo, _ := ctx.GetFuncInfo(key)
+		funcs.SetItem(key, funcInfo)
+	}
+
+	dict = MakeDict()
+	dict.SetItem("vars", vars)
+	dict.SetItem("funcs", funcs)
+	return
+}
+
+func ContextToString(ctx ExprContext, opt FmtOpt) string {
+	dict := ctx.ToDict()
+	return dict.ToString(opt)
 }
diff --git a/operator-context.go b/operator-context.go
index 6b26eed..14037b7 100644
--- a/operator-context.go
+++ b/operator-context.go
@@ -40,7 +40,7 @@ func evalContextValue(ctx kern.ExprContext, opTerm *scan.Term) (v any, err error
 	}
 
 	if sourceCtx != nil {
-		v = contextToDict(sourceCtx)
+		v = sourceCtx.ToDict()
 	} else if childValue != nil {
 		it, ok := childValue.(kern.Iterator)
 		if !ok {
@@ -63,28 +63,6 @@ func evalContextValue(ctx kern.ExprContext, opTerm *scan.Term) (v any, err error
 	return
 }
 
-func contextToDict(ctx kern.ExprContext) (dict *kern.DictType) {
-	// Variables
-	keys := ctx.EnumVars(nil)
-	vars := kern.MakeDict()
-	for _, key := range keys {
-		value, _ := ctx.GetVar(key)
-		vars.SetItem(key, value)
-	}
-	// Functions
-	keys = ctx.EnumFuncs(func(name string) bool { return true })
-	funcs := kern.MakeDict()
-	for _, key := range keys {
-		funcInfo, _ := ctx.GetFuncInfo(key)
-		funcs.SetItem(key, funcInfo)
-	}
-
-	dict = kern.MakeDict()
-	dict.SetItem("vars", vars)
-	dict.SetItem("funcs", funcs)
-	return
-}
-
 // init
 func init() {
 	scan.RegisterTermConstructor(scan.SymDoubleDollar, newContextTerm)
diff --git a/simple-store.go b/simple-store.go
index 0e24374..3f16d16 100644
--- a/simple-store.go
+++ b/simple-store.go
@@ -6,7 +6,6 @@ package expr
 
 import (
 	"fmt"
-	"slices"
 
 	"git.portale-stac.it/go-pkg/expr/kern"
 	"git.portale-stac.it/go-pkg/expr/util"
@@ -77,48 +76,56 @@ func (ctx *SimpleStore) Clone() kern.ExprContext {
 // 	}
 // }
 
-func (ctx *SimpleStore) ToString(opt kern.FmtOpt) string {
-	dict := ctx.ToDict()
-	return dict.ToString(opt)
-}
-
-func (ctx *SimpleStore) varsToDict(dict *kern.DictType) *kern.DictType {
-	names := ctx.EnumVars(nil)
-	slices.Sort(names)
-	for _, name := range ctx.EnumVars(nil) {
-		value, _ := ctx.GetVar(name)
-		if f, ok := value.(kern.Formatter); ok {
-			(*dict)[name] = f.ToString(0)
-		} else if _, ok = value.(kern.Functor); ok {
-			(*dict)[name] = "func(){}"
-		} else {
-			(*dict)[name] = fmt.Sprintf("%v", value)
-		}
-	}
-	return dict
-}
-
-func (ctx *SimpleStore) funcsToDict(dict *kern.DictType) *kern.DictType {
-	names := ctx.EnumFuncs(func(name string) bool { return true })
-	slices.Sort(names)
-	for _, name := range names {
-		value, _ := ctx.GetFuncInfo(name)
-		if formatter, ok := value.(kern.Formatter); ok {
-			(*dict)[name] = formatter.ToString(0)
-		} else {
-			(*dict)[name] = fmt.Sprintf("%v", value)
-		}
-	}
-	return dict
-}
-
 func (ctx *SimpleStore) ToDict() (dict *kern.DictType) {
-	dict = kern.MakeDict()
-	(*dict)["variables"] = ctx.varsToDict(kern.MakeDict())
-	(*dict)["functions"] = ctx.funcsToDict(kern.MakeDict())
-	return
+	return kern.ContextToDict(ctx)
 }
 
+func (ctx *SimpleStore) ToString(opt kern.FmtOpt) string {
+	return kern.ContextToString(ctx, opt)
+}
+
+// func (ctx *SimpleStore) ToString(opt kern.FmtOpt) string {
+// 	dict := ctx.ToDict()
+// 	return dict.ToString(opt)
+// }
+
+// func (ctx *SimpleStore) varsToDict(dict *kern.DictType) *kern.DictType {
+// 	names := ctx.EnumVars(nil)
+// 	slices.Sort(names)
+// 	for _, name := range ctx.EnumVars(nil) {
+// 		value, _ := ctx.GetVar(name)
+// 		if f, ok := value.(kern.Formatter); ok {
+// 			(*dict)[name] = f.ToString(0)
+// 		} else if _, ok = value.(kern.Functor); ok {
+// 			(*dict)[name] = "func(){}"
+// 		} else {
+// 			(*dict)[name] = fmt.Sprintf("%v", value)
+// 		}
+// 	}
+// 	return dict
+// }
+
+// func (ctx *SimpleStore) funcsToDict(dict *kern.DictType) *kern.DictType {
+// 	names := ctx.EnumFuncs(func(name string) bool { return true })
+// 	slices.Sort(names)
+// 	for _, name := range names {
+// 		value, _ := ctx.GetFuncInfo(name)
+// 		if formatter, ok := value.(kern.Formatter); ok {
+// 			(*dict)[name] = formatter.ToString(0)
+// 		} else {
+// 			(*dict)[name] = fmt.Sprintf("%v", value)
+// 		}
+// 	}
+// 	return dict
+// }
+
+// func (ctx *SimpleStore) ToDict() (dict *kern.DictType) {
+// 	dict = kern.MakeDict()
+// 	(*dict)["variables"] = ctx.varsToDict(kern.MakeDict())
+// 	(*dict)["functions"] = ctx.funcsToDict(kern.MakeDict())
+// 	return
+// }
+
 func (ctx *SimpleStore) GetVar(varName string) (value any, exists bool) {
 	if value, exists = ctx.varStore[varName]; !exists && ctx.global != nil {
 		value, exists = ctx.global.GetVar(varName)
diff --git a/t_context_test.go b/t_context_test.go
index 9bb6beb..4295fc3 100644
--- a/t_context_test.go
+++ b/t_context_test.go
@@ -74,7 +74,6 @@ func TestCtrlEnable(t *testing.T) {
 
 	if !CtrlDisable(ctx, varName) {
 		t.Errorf(`%s -- CtrlEnable(ctx, %q) should have returned 'true', got 'false'`, section, varName)
-		// t.Errorf(`%s -- CtrlEnable(ctx, %q) should have returned 'false', got 'true'`, section, varName)
 	}
 
 }
@@ -88,7 +87,7 @@ func TestList(t *testing.T) {
 		/*  3 */ {`string(($$global).funcs.bool)`, `bool(value):boolean{}`, nil},
 	}
 
-	runTestSuiteSpec(t, section, inputs, 3)
-	// runTestSuite(t, section, inputs)
+	// runTestSuiteSpec(t, section, inputs, 3)
+	runTestSuite(t, section, inputs)
 
 }