added limit 1 to arrays treated as a single value in schemas

src/validator/error.rs

@@ -1,9 +1,9 @@
-use std::collections::HashMap;
+use indexmap::IndexMap;
 
 #[derive(Debug, Clone, serde::Serialize)]
 pub struct ValidationError {
   pub code: String,
   #[serde(skip_serializing_if = "Option::is_none")]
-  pub values: Option<HashMap<String, String>>,
+  pub values: Option<IndexMap<String, String>>,
   pub path: String,
 }