Strict equality

src/cache-save.ts

@@ -62,7 +62,7 @@ const cachePackages = async (packageManager: string) => {
   }
 
   const cacheId = await cache.saveCache(cachePaths, primaryKey);
-  if (cacheId == -1) {
+  if (cacheId === -1) {
     // saveCache returns -1 without throwing when the cache was not saved, e.g.
     // a reserve collision or a read-only token (fork PR). @actions/cache has
     // already logged the reason at the appropriate severity, so just trace it.