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mod_s2s: Store real stanzas in session.sendq, rather than strings This is the "right" thing to do. Strings were more memory-efficient, but e.g. bypassed stanza filters at reconnection time. Also not being stanzas prevents us from potential future work, such as merging sendq with mod_smacks. Regarding performance: we should counter the probable negative effect of this change with other positive changes that are desired anyway - e.g. a limit on the size of the sendq, improved in-memory representation of stanzas, s2s backoff (e.g. if a remote server is persistently unreachable, cache this failure for a while and don't just keep forever queuing stanzas for it).

Welcome hackers!

This project accepts and *encourages* contributions. If you would like to get 
involved you can join us on our mailing list and discussion rooms. More 
information on these at https://prosody.im/discuss

Patches are welcome, though before sending we would appreciate if you read 
docs/coding_style.md for guidelines on how to format your code, and other tips.

Documentation for developers can be found at https://prosody.im/doc/developers

Have fun :)