A small 'conceptual' question...
Both Stephan and Philipp's books recommend using principal metadata to
store users' email addresses etc. If I intend to use the email
addresses (and other contact information I want to store for the user)
within the application (i.e., other objects will want to present it on
screen), has it crossed the border from metadata to data, and would it
consequently make sense to define principals with these attributes
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