revert(utils): cache usage

Author: pseudoyu

lib/utils/cache/index.ts

@@ -105,20 +105,22 @@ export default {
         if (typeof key !== 'string') {
             throw new TypeError('Cache key must be a string');
         }
-        const v = await cacheModule.get(key, refresh);
+        let v = await cacheModule.get(key, refresh);
         if (v) {
+            let parsed;
             try {
-                return JSON.parse(v) as T;
+                parsed = JSON.parse(v);
             } catch {
-                // Reason: backward compatibility for values stored without JSON.stringify
-                return v as T;
+                parsed = null;
             }
+            if (parsed) {
+                v = parsed;
+            }
+
+            return v as T;
         } else {
             const value = await getValueFunc();
-            // Reason: always JSON.stringify to preserve types (e.g. numeric strings
-            // like Mastodon IDs would lose precision if stored as bare strings and
-            // later parsed back as numbers by JSON.parse)
-            cacheModule.set(key, JSON.stringify(value), maxAge);
+            cacheModule.set(key, value, maxAge);
 
             return value;
         }