Some simple Option / Result / iterator pattern simplifications

[huitseeker]

Makes a couple of places more readable. Opinions on these refactorings
loosely held, happy to accomodate review desiderata.

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[antiochp]

Had a quick scan through these and yes 👍.
Thanks for this!

Let me take a closer look over the next day or so and we can get this merged in.

[quentinlesceller]

Thank you for the PR @huitseeker! Looking good, few comments about some structure (nothing blocking) but overall good "rustyfication" of the code :)

[antiochp]

Big 👍 on "Opinions on these refactorings loosely held" by the way. Really appreciate this!