split a lumpy abstraction into two cleaner ones

I'm mindful of the way abstractions can create duplicate effort:
  https://flak.tedunangst.com/post/browser-ktrace-browsing

== Kartik's SAD theorem
As programs grow complex, you will be repeatedly forced to either:
  - maintain some State,
  - perform some computations Again,
  - or Duplicate some code.

Here a small amount of duplication seems like the best alternative.
Particularly since no syscalls are involved.

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