Values of this type denote a credential value, e.g. an encrypted password.
=== Allowed values
All printable characters are allowed.
Since a credential contains some kind of secret, the sequence of characters might have some hidden syntax to be interpreted by other parts of Zettelstore.
=== Query comparison
A credential never compares to any other value.
A comparison will never match in any way.
=== Sorting
If a list of zettel should be sorted based on a credential value, the identifier of the respective zettel is used instead.