Editing SimTX API/Compatibility and versioning (section)

=== What a client must do ===
* '''Skip unknown frames.''' A frame whose member you do not know parses with no member set; ignore it and keep reading.
* '''Skip unknown fields''' of every wire type. Generated parsers do; hand-written codecs must.
* '''Keep unknown enum values''' and show them as unknown rather than failing.
* '''Accept unknown string-enumeration names''' from the server and show them as they are.
* '''Use presence.''' Proto3 omits zero values. Fields marked <code>optional</code> say whether they were set; unset means "use the default".
* '''Ignore unknown JSON fields''' from the account service, which follows the same rule.

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