send_payment can return ClosedChannel?

[JssDWt]

The send_payment function returns a Payment object. In order to get the preimage for the payment, you need to go into details. details looks like this:

/// Wrapper for the different types of payments
#[derive(PartialEq, Eq, Debug, Clone, Deserialize, Serialize)]
#[serde(untagged)]
pub enum PaymentDetails {
    Ln {
        #[serde(flatten)]
        data: LnPaymentDetails,
    },
    ClosedChannel {
        #[serde(flatten)]
        data: ClosedChannelPaymentDetails,
    },
}

I think there is no way a payment will return ClosedChannelPaymentDetails? So this signature should only contain LnPaymentDetails to make the development easier.

[JssDWt]

Superseded by #563