Revert "can now inject in headers"

This reverts commit 068f3fd14ab29fe88e435fff5802145a1da780b9.
Revert "session now stores every pickable objects"

This reverts commit 3fc23d942e6939032eb9bdfca98e2d47c7039b8c.
Revert "pedantic improvements"

This reverts commit 22ddf47aecbd87b0719b7e29a32b3a78b5f1254f.