fix: harden url mapping validation

src/Url/UrlMappingCollection.php

@@ -19,6 +19,13 @@ final class UrlMappingCollection {
 		}
 
 		$this->mappings = array_values( $mappings );
+
+		usort(
+			$this->mappings,
+			static function ( UrlMapping $left, UrlMapping $right ): int {
+				return strlen( $right->sourceUrl() ) <=> strlen( $left->sourceUrl() );
+			}
+		);
 	}
 
 	/**