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Idle thought: has there been any consideration for adding an API for `Digest` manipulation where you chain the various filesystem manipulations and then await a single operation sequence?

I’ve had need for a more powerful ability to rename files within a digest. AddPrefix/RemovePrefix is useful but not enough in some situations.

I think the need for a more powerful API has not arisen consistently before now. Your work is probably causing that need to arise consistently.

Yes, Stu has proposed the need for something much more flexible, which we all want but no one has figured out how to model. Please do share any thoughts you have 

a strawdesign would be for it to be a series of imperative commands like a bash script:
```mv $x $y
rm $a```
…but described as a struct:
```RestructuredDigest([
  Mv("x", "y"),
  Rm("a"),
])```