Haskell jock. Backend Developer UX at @mercury. I wrote @prodhaskell so you can get a Haskell job!

Joined February 2013
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my book is good and you should buy it
Production Haskell is complete! In the next few days, you'll be able to find hard copies on Amazon leanpub.com/production-haske…
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Spotify is really good for obscure classical music and really awful for mainstream classical. Funny juxtaposition- my IDAGIO subscription is mostly useful for really popular composers
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managing autonomous AI agents is probably like managing lazy and disinterested human engineers (i've only managed awesome and good engineers so i don't know for sure)
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evaluating Claude and GPT-5.5 by giving them the same tasks in separate subtrees and seeing which one does better
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ok now that I've had coffee and can evaluate/review myself: Codex was Goodharting- 2.43x improvement is actually "20s constant cached" and the memory use was actually higher, but a config change masked it. Claude's 10% gain was honest but also behavior changing and failed tests
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Codex est'd token spend is $113 (API rates). Claude is $31 (from `/cost`). I think Claude is the winner in this. Or at least the best loser? Clearly more aligned with my intent than Codex. Cheaper. Failed fast.
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Author: Matt Parsons Co-Author: GHC
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Matt Parsons retweeted
I strongly believe there are entire companies right now under heavy AI psychosis and its impossible to have rational conversations about it with them. I can't name any specific people because they include personal friends I deeply respect, but I worry about how this plays out. I lived through the great MTBF vs MTTR (mean-time-between-failure vs. mean-time-to-recovery) reckoning of infrastructure during the transition to cloud and cloud automation. All those arguments are rearing their ugly heads again but now its... the whole software development industry (maybe the whole world, really). It's frightening, because the psychosis folks operate under an almost absolute "MTTR is all you need" mentality: "its fine to ship bugs because the agents will fix them so quickly and at a scale humans can't do!" We learned in infrastructure that MTTR is great but you can't yeet resilient systems entirely. The main issue is I don't even know how to bring this up to people I know personally, because bringing this topic up leads to immediately dismissals like "no no, it has full test coverage" or "bug reports are going down" or something, which just don't paint the whole picture. We already learned this lesson once in infrastructure: you can automate yourself into a very resilient catastrophe machine. Systems can appear healthy by local metrics while globally becoming incomprehensible. Bug reports can go down while latent risk explodes. Test coverage can rise while semantic understanding falls. Changes happens so fast that nobody notices the underlying architecture decaying. I worry.
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thinking about fucking up my life (moving to Golden)
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watched The Devil Wears Prada 1 and 2 this past weekend man, the sequel really isn't even on the same level at all
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Claude, writing a poem: You can only see your blind spot by putting a thing inside it and watching what doesn't happen.
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Matt Parsons retweeted
Production Haskell by Matt Parsons is on sale on Leanpub! Its suggested price is $40.00; get it for $22.50 with this coupon: leanpub.com/production-haske… @mattoflambda #haskell
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Incredible thing to see as I land in Keflavík and open my phone
DO NOT FALL PREY FOR THE 'FREE' REYKJAVIK LAYOVER ON CHEAP ICELAND AIR FLIGHTS TO EUROPE It's just their loss-leader strategy so you can be skinned alive the moment you land. Impressive as a marketing strategy; Kafkaesque while being pushed through their 'funnel'.
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Thought process: Lol
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Florence has good flowers
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The wave of relaxation that washes over me as the Italian waiter speaks perfect English and forgives me my horrible grazie
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Civilized yet undomesticated
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Edinburgh is dope
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