Hugh has never heard of milli sats. And if we run out of milli sats we'll use micro sats
not on the base layer and only via rounding on lightning (you don't want to have to round with smaller and smaller denominated units with final settlement) https://lightningwiki.net/index.php/Denominations
"The amount is rounded down to the nearest satoshi when the channel is closed and broadcast to the blockchain to adhere to bitcoins specification."
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It'd require a hard fork to get millisats on chain, but I'd support it if it were needed.
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