Rev: Import extensions

[RobinTail]

This reverts #2974
Not going to go that direction.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch rev-extensions

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[coveralls-official]

coverage: 100.0%. remained the same
when pulling c471e24 on rev-extensions
into 2bf1db5 on master.