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Pants

i had roughly looked at a hierarchy like this for the “compute Paths without Snapshotting them” change:
```   Snapshot    &lt;- Digest &lt;- Paths &lt;- PathGlobs
DigestContents &lt;-```

hm. having copied that again, i’m not sure why i did `Snapshot &lt;- Digest` there.

perhaps that was ergonomic, because you can discard the Paths immediately if you don’t need them.

but the implementation is roughly: 1) expand PathGlobs into Path(Stats), 2) digest all Paths to compute a Digest for the whole thing, 3) compose the Digest and the Paths into a Snapshot