Removed eval() function from ast interface and implementation. Check on preset control variables is now done in initDefaultVars()

ast.go

@@ -10,7 +10,6 @@ import (
 
 type Expr interface {
 	Eval(ctx ExprContext) (result any, err error)
-	eval(ctx ExprContext, preset bool) (result any, err error)
 	String() string
 }
 
@@ -106,16 +105,10 @@ func (self *ast) Finish() {
 }
 
 func (self *ast) Eval(ctx ExprContext) (result any, err error) {
-	return self.eval(ctx, true)
-}
-
-func (self *ast) eval(ctx ExprContext, preset bool) (result any, err error) {
 	self.Finish()
 
 	if self.root != nil {
-		if preset {
-			initDefaultVars(ctx)
-		}
+		initDefaultVars(ctx)
 		if self.forest != nil {
 			for _, root := range self.forest {
 				if result, err = root.compute(ctx); err == nil {