The default module is not public, so can't be used to get the default credential builder

[brotskydotcom]

The default module, which is aliased to whichever platform-specific credential store module is being used for Entry::new, is not exposed publicly, and so there's no platform-independent way to access the default credential store (i.e., default::default_credential_builder()). This makes it hard to write platform-independent code that calls the default credential builder API (e.g., to check the persistence value).

Reported by @ReactorScram.