[NicolasHug]

Probed in C++ with giflib: we walk the records like DGifSlurp() but skip the image data instead of LZW-decoding it. GIF has no frame count in its header so every data sub-block must be visited, which C++ does ~3x faster than Python on large animated GIFs. Paths go through a FileIO-backed reader (DGifOpenFileName opens files in text mode on Windows).

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✅ You can merge normally! (6 Unrelated Failures)

As of commit 52d04d7 with merge base ffb098a ():

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• Windows CUDA / install-and-test (3.11, 13.0, 9) (gh) (similar failure)
  Unable to download artifact(s): Artifact not found

BROKEN TRUNK - The following jobs failed but was present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Windows CUDA / install-and-test (3.11, 13.0, 4) (gh) (trunk failure)
• Windows CUDA / install-and-test (3.11, 13.0, 6) (gh) (trunk failure)
  Unable to download artifact(s): Artifact not found
• Windows CUDA / install-and-test (3.11, 13.0, 7) (gh) (trunk failure)
  Unable to download artifact(s): Artifact not found
• Windows CUDA / install-and-test (3.11, 13.0, 8) (gh) (trunk failure)
• Windows CUDA / install-and-test-on-cpu-only-machine (gh) (trunk failure)
  Unable to download artifact(s): Artifact not found

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