Merge is the integration point
When a pull request satisfies its review and automated checks, GitHub can integrate it according to the repository's allowed merge methods.
Common merge strategies
A merge commit preserves branch topology. Squashing combines the pull request's changes into one commit on the target branch. Rebase-and-merge creates a linear history by replaying the commits without a merge commit.
Choose according to project policy
Different teams prefer different history styles. The important point is to use a consistent policy that keeps history understandable and does not rewrite shared work unexpectedly.
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