Expose private site properties to authenticated users only

[frankiejarrett]

Unlike published content, options can be security-sensitive and should not be exposed to everyone.

So while we were combing through options recently, we discussed each one and determined whether or not we felt it should be public or private.

[danielbachhuber]

Generally, a good rule of thumb as to whether an option should be public or private is whether it's already publicly exposed (e.g. indirect UI, body class added, etc.). If it's not exposed as a variable on the frontend, then it should remain private.

[frankiejarrett]

@danielbachhuber :+1: good rule