Circe Value Class codecs

circe.scala

implicit def decoderValueClass[T <: AnyVal, V](
    implicit
    g: Lazy[Generic.Aux[T, V :: HNil]],
    d: Decoder[V]
): Decoder[T] = Decoder.instance { cursor ⇒
    d( cursor ).map { value ⇒
        g.value.from( value :: HNil )
    }
}

implicit def encoderValueClass[T <: AnyVal, V](
    implicit
    g: Lazy[Generic.Aux[T, V :: HNil]],
    e: Encoder[V]
): Encoder[T] = Encoder.instance { value ⇒
    e( g.value.to( value ).head )
}