@Deprecated
    public LPSubjectReference deserialize(String serializedReference) {
        Objects.requireNonNull(serializedReference, "serializedReference");
        List<String> parts = Splitter.on('/').limit(2).splitToList(serializedReference);
        return obtain(parts.get(0), parts.get(1));
    }
Cache based factory for SubjectReferences.

Using a factory and caching here makes the Subject cache in SubjectReference
more effective. This reduces the no. of times i/o is executed due to resolve calls
within the SubjectReference.

It's perfectly ok if two instances of the same SubjectReference exist. (hence the 1 hour expiry)
sponge/sponge-service/src/main/java/me/lucko/luckperms/sponge/service/reference/SubjectReferenceFactory.java