obsolete: store user name and note in UTF-8 (issue5754) (BC)
Before, user names were stored in local encoding and transferred across
repositories, which made it impossible to restore non-ASCII user names on
different platforms. This patch fixes new markers to be encoded in UTF-8
and decoded back to local encoding when displaying. Existing markers are
unfixable so they may result in mojibake.
I don't like the API that requires metadata dict to be UTF-8 encoded, which
is a source of bugs, but there's no abstraction layer to process the encoding
thingy efficiently. So we apply the same rule as extras dict to obsstore
metadata.
public attribute not declared in interfaces: badpeer.badattribute
public attribute not declared in interfaces: badpeer.badmethod