The use of Transaction outside of the radicle crate requires that a newtype is used, if the upstream code wants to write methods, such as:

pub struct Transaction<R>(store::Transaction<MyCob, R>);

impl Transaction<R> {
  pub fn add_foo(&mut self, foo: Foo) -> Result<(), store::Error> { /* code */ }
  pub fn add_bar(&mut self, bar: Bar) -> Result<(), store::Error> { /* code */ }}

This works up until the point that it tries to re-use the Transaction::initial method.

To make this possible, the method needs to know that it can be converted to the upstream Transaction and back to radicle Transaction.

Rebased