further improvements

internal/object/bool.go

@@ -4,10 +4,22 @@ import (
 	"fmt"
 )
 
+var (
+	TRUE  = Boolean{Value: true}
+	FALSE = Boolean{Value: false}
+)
+
 type Boolean struct {
 	Value bool
 }
 
+func NewBoolean(value bool) Boolean {
+	if value {
+		return TRUE
+	}
+	return FALSE
+}
+
 func (b Boolean) Bool() bool {
 	return b.Value
 }