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Sender wallet presents some max-amount that will leave your account.
StreamSender needs to enforce that this max is the most that leaves the account.
Question: Does the lower-level sender need knowledge around how much its delivering?
JS StreamController interface: break sender up into as many little state machines as possible (max packets; liquidity congestion; setting the amount and tracking amount paid; pacing).
Neil
Durability is aimed at knowing the state of any given stream payment.
We could go back and retry. Or we could just do another payment.
How do we get a fixed amount in receiver's units where things like FX/slippage could be unknown until the sender gets it.
What should STREAMSender do if the FX rate goes against the sender and the payment cannot be completed?
Kincaid: FX rates are that big of a deal because they don't fluctuate that frequently.
Could happen but is unlikely.
Bigger issue is sending packets that fail due to rounding errors, ultimately failing the payment.
Accurately probing an FX rate is pretty hard because different-sized packets have different rounding errors. Some packets divide nicely but others don't.
Ideas
Fixed-exchange rate path guarantees could be an interesting solution here.
Many mini-state machines to control for each thing independently (e.g., amount delivered should be distinct from time).
Try to complete a payment, but plan on failure.
Kincaid
Majority of incomplete payments are caused by unimplemented features or bugs in implementations.
Very tiny fraction of payments are caused by network errors or intermediary manipulation.
Create a "guidance doc" for state machines and approaches to building a STREAM sender.
2020-06-03 HL Quilt Community Call.m4a