Function IsEncryptedSentinel

IsEncryptedSentinel(value: string | null | undefined): boolean
Checks if a value is the encrypted sentinel, indicating a protected value that was not disclosed to the client.
Parameters
- value: string | null | undefined
  The value to check
Returns boolean
True if the value equals the encrypted sentinel, false otherwise
Example
```
import { IsEncryptedSentinel, ENCRYPTED_SENTINEL } from '@memberjunction/global';

console.log(IsEncryptedSentinel('[!ENCRYPTED$]')); // true
console.log(IsEncryptedSentinel('somevalue'));     // false
console.log(IsEncryptedSentinel(null));            // false
```
- Defined in EncryptionUtils.ts:72