Ensure the state is a string or an array of strings when initializing the select

packages/support/resources/js/utilities/select.js

@@ -51,6 +51,12 @@ export class Select {
         statePath = null,
         onStateChange = () => {},
     }) {
+        if (Array.isArray(state)) {
+            state = state.map((item) => item.toString())
+        } else if (state !== null) {
+            state = state.toString()
+        }
+
         this.element = element
         this.options = options
         this.originalOptions = JSON.parse(JSON.stringify(options)) // Keep a copy of original options
@@ -600,7 +606,7 @@ export class Select {
                 }
 
                 // If not found, add to missing values
-                missingValues.push(value.toString())
+                missingValues.push(value)
             }
         }