Remove pre-created EMPTY_PARAMS object and use Object.create(null)

Author: jkyberneees

lib/router/sequential.js

@@ -40,14 +40,6 @@ module.exports = (config = {}) => {
 
   const routers = {}
 
-  /**
-   * Pre-create frozen empty objects for better performance and safety.
-   * Use Object.create(null) for prototype pollution protection.
-   * Frozen objects prevent accidental mutation that could cause cross-request state pollution.
-   * These are reused across requests when no query params or route params are present.
-   */
-  const EMPTY_PARAMS = Object.freeze(Object.create(null))
-
   /**
    * Initialize LRU cache for route matching results with optimized settings.
    * Cache keys are method+path combinations to speed up repeated lookups.
@@ -161,7 +153,7 @@ module.exports = (config = {}) => {
       // Optimized parameter assignment with minimal overhead
       if (!req.params) {
         // Use pre-created empty object or provided params directly
-        req.params = params || EMPTY_PARAMS
+        req.params = params || Object.create(null)
       } else if (params) {
         // Manual property copying - optimized for small objects
         // Pre-compute keys and length to avoid repeated calls