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newc's Issues

let return value's type to be an interface

Like the struct myDoer below:

type Doer interface {
    Do() (int, error)
}

type myDoer struct {
    v int
}

func (r *myDoer) Do() (int, error) {
    // ...
    return 0, nil
}

And myReader's constructor sig shall be like:

func NewMyDoer(v int) Doer

instead of

func NewMyDoer(v int) *myDoer

It can be an option, and user can choose its constructor to return an pointer or an designated interface.

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