refactor: few minor tweaks

Author: ACTCD

.gitattributes

@@ -1,3 +1,7 @@
-package-lock.json linguist-generated
-pnpm-lock.yaml linguist-generated
+# https://git-scm.com/docs/gitattributes
+# https://git-scm.com/book/en/Customizing-Git-Git-Attributes
+* text=auto
+
+# https://docs.github.com/en/repositories/working-with-files/managing-files/customizing-how-changed-files-appear-on-github
+# https://github.com/github-linguist/linguist/blob/master/docs/overrides.md
 public linguist-generated

src/ext/content-scripts/api.js

@@ -21,7 +21,9 @@ async function getValue(key, defaultValue) {
 	}
 	const prefixedKey = `${sid}---${key}`;
 	const results = await browser.storage.local.get(prefixedKey);
-	return results[prefixedKey] ?? defaultValue ?? undefined;
+	if (prefixedKey in results) return results[prefixedKey];
+	if (defaultValue !== undefined) return defaultValue;
+	return undefined;
 }
 
 async function deleteValue(key) {