PR #66101 - fixed an indexing bug where negative-slice indexers produced incorrect results, in the most widely-used data library in the Python ecosystem. Shipped with a regression test following the project's contribution and testing conventions.

PR #3540 - added a configurable cap on rate-limit retries, so long-running GitHub API jobs (like repository-mining pipelines) can fail fast instead of blocking indefinitely when they hit the API rate limit.

PR #320 (closing #317) - skip_whitespaces was respected when reading per-file diffs, but silently ignored when computing commit-level insertion/deletion counts, producing inconsistent numbers for the same commit depending on which API was called. Traced the bug to two git subprocess calls missing the relevant flag, fixed both, and added a regression test reusing the project's existing fixture infrastructure.

PR #321 (closing #226) - added Commit.patch, returning the full unified diff of a commit, closing a two-year-old feature request. Rather than reconstructing git's patch-header format manually, delegated directly to git itself, then stress-tested the implementation against root commits, normal commits, and merge commits before writing a single line into the main codebase.

#283 - the maintainer had flagged this as unsolved: commit objects lose access to their stats after being collected into a list, due to a context-manager lifecycle issue. The obvious fix - falling back to the commit's own internal git reference - appeared to work in local testing. Pushing further, tested it against a remote, cloned repository and found it only succeeded due to a Windows-specific quirk where deleted files' handles stay briefly readable; the same fix would likely fail unpredictably on Linux CI or under different timing. Reported the finding with full reasoning and evidence rather than submitting a fix that couldn't be fully stood behind.