diff --git a/ast.go b/ast.go
index 3ba7979..f8299a9 100644
--- a/ast.go
+++ b/ast.go
@@ -119,7 +119,7 @@ func (self *ast) eval(ctx ExprContext, preset bool) (result any, err error) {
 		if self.forest != nil {
 			for _, root := range self.forest {
 				if result, err = root.compute(ctx); err == nil {
-					ctx.setVar(ControlLastResult, result)
+					ctx.UnsafeSetVar(ControlLastResult, result)
 				} else {
 					//err = fmt.Errorf("error in expression nr %d: %v", i+1, err)
 					break
@@ -128,7 +128,7 @@ func (self *ast) eval(ctx ExprContext, preset bool) (result any, err error) {
 		}
 		if err == nil {
 			result, err = self.root.compute(ctx)
-			ctx.setVar(ControlLastResult, result)
+			ctx.UnsafeSetVar(ControlLastResult, result)
 		}
 		// } else {
 		// 	err = errors.New("empty expression")
diff --git a/context-helpers.go b/context-helpers.go
index 46b3fee..0d9f951 100644
--- a/context-helpers.go
+++ b/context-helpers.go
@@ -15,7 +15,7 @@ func exportVar(ctx ExprContext, name string, value any) {
 	if name[0] == '@' {
 		name = name[1:]
 	}
-	ctx.setVar(name, value)
+	ctx.UnsafeSetVar(name, value)
 }
 
 func exportFunc(ctx ExprContext, name string, info ExprFunc) {
diff --git a/context.go b/context.go
index 0bbebe6..7b2c50b 100644
--- a/context.go
+++ b/context.go
@@ -33,7 +33,7 @@ type ExprContext interface {
 	Clone() ExprContext
 	GetVar(varName string) (value any, exists bool)
 	SetVar(varName string, value any)
-	setVar(varName string, value any)
+	UnsafeSetVar(varName string, value any)
 	EnumVars(func(name string) (accept bool)) (varNames []string)
 	EnumFuncs(func(name string) (accept bool)) (funcNames []string)
 	GetFuncInfo(name string) (item ExprFunc, exists bool)
diff --git a/operand-func.go b/operand-func.go
index e92ec3a..b0b199b 100644
--- a/operand-func.go
+++ b/operand-func.go
@@ -87,10 +87,10 @@ func (functor *funcDefFunctor) Invoke(ctx ExprContext, name string, args []any)
 			if functor, ok := arg.(Functor); ok {
 				ctx.RegisterFunc(p, functor, 0, -1)
 			} else {
-				ctx.setVar(p, arg)
+				ctx.UnsafeSetVar(p, arg)
 			}
 		} else {
-			ctx.setVar(p, nil)
+			ctx.UnsafeSetVar(p, nil)
 		}
 	}
 	result, err = functor.expr.eval(ctx, false)
diff --git a/operator-assign.go b/operator-assign.go
index 34c5742..043bcc1 100644
--- a/operator-assign.go
+++ b/operator-assign.go
@@ -44,7 +44,7 @@ func evalAssign(ctx ExprContext, self *term) (v any, err error) {
 			}
 			ctx.RegisterFunc(leftTerm.source(), functor, minArgs, maxArgs)
 		} else {
-			ctx.setVar(leftTerm.source(), v)
+			ctx.UnsafeSetVar(leftTerm.source(), v)
 		}
 	}
 	return
diff --git a/operator-coalesce.go b/operator-coalesce.go
index 6cb8171..18d5205 100644
--- a/operator-coalesce.go
+++ b/operator-coalesce.go
@@ -75,7 +75,7 @@ func evalAssignCoalesce(ctx ExprContext, self *term) (v any, err error) {
 			ctx.RegisterFunc(leftTerm.source(), functor, 0, -1)
 		} else {
 			v = rightValue
-			ctx.setVar(leftTerm.source(), rightValue)
+			ctx.UnsafeSetVar(leftTerm.source(), rightValue)
 		}
 	}
 	return
diff --git a/simple-var-store.go b/simple-var-store.go
index ae5e3a9..a5e3b3c 100644
--- a/simple-var-store.go
+++ b/simple-var-store.go
@@ -36,7 +36,7 @@ func (ctx *SimpleVarStore) GetVar(varName string) (v any, exists bool) {
 	return
 }
 
-func (ctx *SimpleVarStore) setVar(varName string, value any) {
+func (ctx *SimpleVarStore) UnsafeSetVar(varName string, value any) {
 	// fmt.Printf("[%p] setVar(%v, %v)\n", ctx, varName, value)
 	ctx.varStore[varName] = value
 }
@@ -98,8 +98,8 @@ func varsCtxToBuilder(sb *strings.Builder, ctx ExprContext, indent int) {
 			sb.WriteString(f.ToString(0))
 		} else if _, ok = value.(Functor); ok {
 			sb.WriteString("func(){}")
-		} else if _, ok = value.(map[any]any); ok {
-			sb.WriteString("dict{}")
+			// } else if _, ok = value.(map[any]any); ok {
+			// 	sb.WriteString("dict{}")
 		} else {
 			sb.WriteString(fmt.Sprintf("%v", value))
 		}