- Continued work on SearchRequest migration and fixed some more QueryBuilder migration too

src/QueryBuilder/Sql/MysqlQueryBuilder.php

@@ -507,6 +507,15 @@ class MysqlQueryBuilder extends SqlQueryBuilder
             $key = ":p" . $this->parameterIndex++;
         }
 
+        if ($value instanceof \UnitEnum) {
+            if ($value instanceof \BackedEnum) {
+                $value = $value->value;
+            }
+            else {
+                throw new \InvalidArgumentException("Using UnitEnum as a parameter is currently unsupported. Try using a BackedEnum instead.");
+            }
+        }
+
         $this->parameters[$key] = $value;
 
         return $key;