fixing ordering checkpoint

src/validator/rules/polymorphism.rs

@@ -1,6 +1,7 @@
 use crate::validator::context::ValidationContext;
 use crate::validator::error::ValidationError;
 use crate::validator::result::ValidationResult;
+use indexmap::IndexMap;
 
 impl<'a> ValidationContext<'a> {
   pub(crate) fn validate_family(
@@ -65,7 +66,7 @@ impl<'a> ValidationContext<'a> {
 
   pub(crate) fn execute_polymorph(
     &self,
-    options: &std::collections::BTreeMap<String, (Option<usize>, Option<String>)>,
+    options: &IndexMap<String, (Option<usize>, Option<String>)>,
     result: &mut ValidationResult,
   ) -> Result<bool, ValidationError> {
     // 1. O(1) Fast-Path Router & Extractor