getAndPut abstract method
Associates the specified value with the specified key in this cache,
returning an existing value if one existed. If the cache previously contained
a mapping for the key, the old value is replaced by the specified value.
key: key with which the specified value is to be associatedvalue: value to be associated with the specified keydelegate: provides the caller a way of changing the VaultEntry before persistence
The previous value is returned, or null if there was no value
associated with the key previously.
Implementation
@override
Future<T?> getAndPut(String key, T value, {VaultEntryDelegate<T>? delegate});