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Introduced Runner API for cleaner client embedding #27

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Introduced Runner interface which exposes a single method: Run(query Exp) *Rows. Exp.Run

now expects a Runner rather than a concrete *Session).

The purpose is to allow clients to cleanly embed Session (say to provide connection pooling):

type WrappedSession struct {
*rethinkgo.Session
}

Without the interface, you'd need to use wrapper.Session everywhere. With it, you can simply use wrapper.

…Exp) *Rows. Exp.Run

now expects a Runner rather than a concrete *Session).

The purpose is to allow clients to cleanly embed Session (say to provide connection pooling):

type WrappedSession struct {
   *rethinkgo.Session
}
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