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There should be one merge command which does the right thing, and
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which is called 'merge'.
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The merge command pulls a changeset or a range of changesets into your
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tree. It knows what changes have already been integrated and avoids
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There should be some intelligence about working out what changes have
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The tool intelligently chooses (or perhaps synthesizes) an ancestor
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and two trees to merge. These are then intelligently merged.
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Merge should refuse to run (unless forced) if there are any
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uncommitted changes in your tree beforehand. This has two purposes:
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if you mess up the merge you won't lose anything important; secondly
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this makes it more likely that the merge will be relatively pure.