Ferrous Systems programming style/tips for !! This looks really good!

@zkat Oh rad, I just shared this in my work rust channel, articulates a few things very nicely that I've tried to convey, and adds a nice pile of new to me things on top of the stuff I knew.

@zkat most of the time I combat the pyramid of doom of rightward pressure by assigning matches, ifs, etc... to local variables. Also, keeping functions short generally helps. Rightward shift has rarely been an issue for years (still let-else will be appreciated)

@zkat Really useful, thankyou for that link. Still getting my head around the _why_ of some parts, but I know I'll get there

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