Implement IMAP4 non-synchronizing literals about go-imap HOT 10 CLOSED

See also: https://tools.ietf.org/html/rfc7888

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Oh yeah, you're right, the RFC I mentioned has been obsoleted. Thanks :)

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no problem :)

I just implemented LITERAL- last night for my own IMAP library :)

They are so easy to miss!

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The server side of this has been implemented in #258

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It includes LITERAL+ only though.

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Oh, right. I don't think there's any point in supporting LITERAL-.

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LITERAL- is really meant to be used for not needing to synchronize when sending literals in common cases (e.g. mailbox names, SEARCH expressions, etc) but still having the ability to enforce synchronization during operations like APPEND (at least for messages that have size > 4k or so).

That's how GMail makes use of LITERAL-.

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The RFC says that APPENDLIMIT should cover the APPEND case.

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The server side of this has been implemented in #258

I wonder how client support should look like. Use non-synchronizing literals for small ones (and probably support LITERAL- in the client then)?

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Maybe we could:

1. Add LITERAL- support
2. Move over the APPENDLIMIT extension to this repo
3. Add LITERAL+ support

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