saml-nameid persistentId encoding setting

[Cantor, Scott]

> My question is, since I have not been setting this, what is the default behavior?

The wiki documents that, see NameIDGenerationConfiguration

> I want to ensure that if I add it, I set it properly so that the values I'm already
> passing are not changed.

Not setting it is guaranteed by our versioning policy to result in the same outcome since it cannot be present after an upgrade.

-- Scott