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readme: mention compat string format
Wed, 11 Mar 2020 16:11:04 +0700, by Anton Shestakov
readme: copywrite the section about branch policy, wrap long lines
Wed, 11 Mar 2020 15:55:36 +0700, by Anton Shestakov
compat: update hg-X.Y compat comments and test them
Tue, 10 Mar 2020 19:05:08 +0700, by Anton Shestakov

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