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context: optimize _parents()...
context: optimize _parents() This patch avoids some extra attribute lookups and list mutations. This micro-optimization seems to result in a minor speedup for `hg log` on my Firefox repo: before: 25.35s after: 24.91s delta: -0.44s (98% of original) Not the biggest gain. But every little bit helps.

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multirevs.txt
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When Mercurial accepts more than one revision, they may be specified
individually, or provided as a topologically continuous range,
separated by the ":" character.
The syntax of range notation is [BEGIN]:[END], where BEGIN and END are
revision identifiers. Both BEGIN and END are optional. If BEGIN is not
specified, it defaults to revision number 0. If END is not specified,
it defaults to the tip. The range ":" thus means "all revisions".
If BEGIN is greater than END, revisions are treated in reverse order.
A range acts as a closed interval. This means that a range of 3:5
gives 3, 4 and 5. Similarly, a range of 9:6 gives 9, 8, 7, and 6.