extensions: recommend against using wrapfunction for repo methods
Instead, all extensions should use the "dynamic subclass" trick:
subclass repo.__class__ and then replace repo.__class__ with your new
subclass. This avoids conflicts that happen when one extension uses
wrapfunction and another uses subclassing to extend the same method of
localrepository.
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test 1:16b24da7e457
test2 1:16b24da7e457
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* test 1:9f1b7e78eff8
* test2 1:9f1b7e78eff8