setSecure static method
Saves a value encrypted (key in Keychain/Keystore/Credential Manager/libsecret). await ULocalStorage.setSecure("pin", "1234"). macOS: unsigned debug builds show a Keychain password prompt after each rebuild; Team-signed apps never do.
Implementation
static Future<void> setSecure(String key, Object? value, {Duration? expireTime}) => UStorage.secure.set(key, value, ttl: expireTime);