[swift-evolution] [Update] Updates to SE-0166 and SE-0167

[Itai Ferber]

Hi swift-evolution,

Over the course of the past few weeks, we’ve been gathering feedback 
about the outcome of 
[SE-0166](https://github.com/apple/swift-evolution/blob/master/proposals/0166-swift-archival-serialization.md) 
and 
[SE-0167](https://github.com/apple/swift-evolution/blob/master/proposals/0167-swift-encoders.md) 
(both internally and externally), and we gathered a collection of 
updates that we’re going to introduce to the proposals and to the 
implementation.

Attached is rendered HTML (I don’t want to make your mail clients 
unusable like last time!) that lays out what we’d like to do. We’re 
not looking to do a full review of these changes, but if you have 
feedback or questions, we’re happy to get responses here.

Please note that some of these features have already been implemented 
(the new error types, some of the optionality changes, collection 
conformances, etc.), but we are receptive to comments on all of it. The 
existing proposals will also be updated to incorporate these updates.

Thanks for all of your feedback!

— Itai
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