Could we get module-private visibility?

[Mike Hearn]

Yes, I know. I'm talking about module-private inside exported packages.
Otherwise it can be quite difficult to allow exported and non-exported
packages to work closely together without weakening visibility, and at any
rate, whilst the compatibility considerations are obvious, having a
visibility level of "public" that's actually private to a scope is not a
design anyone would pick if they had a blank slate I imagine!