Hi.

I'm implementing a generic (and very simple) interface for key-value 
databases, and I'm using the standard database/sql package as a reference.
The only difference is that I don't plan to have a Driver interface, but 
only a Database and Tx interfaces.

For starting a transaction I'm thinking of something like this:

type TxMode int

const (
    ReadOnly TxMode iota
    ReadWrite
)

func Begin(mode TxMode) (Tx, error)


Now, that problem is that this type needs to be used by both the driver and 
the database packages.

For the standard database/sql package, the TxOptions type is duplicated.
Is there a reason for this duplication?
I was thinking of declaring the TxMode in the driver package and using a 
type alias in the database package, but I'm not sure.


Thanks
Manlio Perillo

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