fixes connection cleanup in %lient (use correct duct)
++ cleanup-connection
|= id=@ud
^- ^state
+ ?~ con=(~(get by connection-by-id.state) id)
+ state
%_ state
connection-by-id (~(del by connection-by-id.state) id)
- connection-by-duct (~(del by connection-by-duct.state) duct)
+ connection-by-duct (~(del by connection-by-duct.state) duct.u.con)
==
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