fix: apply code review comments/suggestions

Author: pieh

src/run/handlers/cache.cts

@@ -67,7 +67,9 @@ export class NetlifyCacheHandler implements CacheHandlerForMultipleVersions {
         const revalidateAfter = revalidate * 1_000 + blob.lastModified
         return (revalidateAfter - Date.now()) / 1_000
       }
-      return revalidate === false ? 'PERMANENT' : 'NOT SET'
+      if (revalidate === false) {
+        return 'PERMANENT'
+      }
     }
 
     return 'NOT SET'

src/run/handlers/server.ts

@@ -112,14 +112,14 @@ export default async (
     }
 
     const nextCache = response.headers.get('x-nextjs-cache')
-    const isServedFromCache = nextCache === 'HIT' || nextCache === 'STALE'
+    const isServedFromNextCache = nextCache === 'HIT' || nextCache === 'STALE'
 
     topLevelSpan.setAttributes({
       'x-nextjs-cache': nextCache ?? undefined,
-      isServedFromCache,
+      isServedFromNextCache,
     })
 
-    if (isServedFromCache) {
+    if (isServedFromNextCache) {
       await adjustDateHeader({
         headers: response.headers,
         request,