wireprotov2: expose rich arguments metadata Now that we internally store rich metadata about arguments, it makes sense to make that metadata available to the client. This will allow clients to validate outgoing command requests before they are sent over the wire. Strictly speaking, we should bump the wire protocol version for this change since it is backwards incompatible. But no client-side code touches the arguments map and I don't want to incur the work. Differential Revision: https://phab.mercurial-scm.org/D4618

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  $ echo "[extensions]" >> $HGRCPATH

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  $ echo "mq=" >> $HGRCPATH

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  $ hg init

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  $ echo 'base' > base

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  $ hg ci -Ambase

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  adding base

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  $ hg qnew -mmqbase mqbase

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  $ hg qsave

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  $ hg qrestore 2

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  restoring status: hg patches saved state

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