iiinova — where your digital self keeps evolving

yoshi-taka @ask-yoshi-taka.bsky.social · 28/08/2026

I explored how bounding Gregorian years to 1–9999 can speed up day-of-week, days_from_civil, and civil_from_days calculations—using magic-number division, shifts, Julian mapping, and packed tables. Benchmarks, proofs, and TypeScript/Rust/C implementations: medium.com/@ask-yoshi-t...

medium.com

Faster Gregorian Calendar Calculations for Years 1 Through 9999

I recently wrote three articles about specializing well-known Gregorian calendar algorithms for the bounded year range 1..9999.

000

Reposted by yoshi-taka

水田孝信 (Takanobu MIZUTA) @takanobumizuta.bsky.social · 28/08/2026

GPIFのような巨大な基金は流動性的にパッシブ主体にならざるを得ない。でもパッシブが機能するのは他投資家の値付けがあるからでこの価格発見機能の維持のためにもアクティブを買わざるを得ない。買わざるを得ない理由は他にもいろいろあって、、、、 www.sparx.co.jp/report/detai...

sparx.co.jp

株式投資で気候変動を考慮することに賛否があるのはなぜか？：気候変動解決でリターンを得る投資戦略 | レポート | スパークス・アセット・マネジメント

株式投資で気候変動を考慮することに賛否があるのはなぜか？：気候変動解決でリターンを得る投資戦略。スパークス・アセット・マネジメント株式会社は、1989年に創業した独立系の投信投資顧問会社です。

011

yoshi-taka @ask-yoshi-taka.bsky.social · 26/08/2026

I optimized days_from_civil veritycost.com/en/posts/fas... In inline batch benchmarks on Apple Silicon, the bounded implementation reduced execution time by approximately 29–50% compared with the usual Hinnant implementation across Bun, Rust, and C in the tested environment.

veritycost.com

A Faster days_from_civil Using Magic-Number Division

Restricting years to 1..9999 and replacing the constant divisions in days_from_civil with multiplication, bit shifts, and a month table

000

yoshi-taka @ask-yoshi-taka.bsky.social · 25/08/2026

I optimized Sakamoto’s day-of-week algorithm for years 1–9999 using two magic constants: 5243 and 74899. The C version was ~30% faster on Apple Silicon. The article includes implementations in C, Rust, and TypeScript, proofs, and exhaustive verification. veritycost.com/en/posts/fas...

veritycost.com

000

yoshi-taka @ask-yoshi-taka.bsky.social · 19/08/2026

If advances in coding agents make the social and collaborative aspects of software development unnecessary, including both open-source contributions and collaboration within companies, then there’s no need to use GitHub anymore, right? It would be little more than a software distribution platform.

000

yoshi-taka @ask-yoshi-taka.bsky.social · 18/08/2026

Vibe-coded apps built by non-developers are starting to spread, and, unsurprisingly, they’re riddled with bugs: forms that don’t save submissions, inaccurate accounting reports, and the list goes on. I just wish they’d at least test them.

010

yoshi-taka @ask-yoshi-taka.bsky.social · 13/08/2026

Excluding Chrome from Spotlight indexing saved me about 1 GB of memory.

010

yoshi-taka @ask-yoshi-taka.bsky.social · 11/08/2026

なにもしてないのにX凍結中です web上にあるいくつかの同事例を見る限り解除にはおそらく数週間かかるでしょう誰も何もテストしてないようなフローや文面が辛い🫠 今使っているサービスの中では最低のサービスです NPSでいえば0 使いづらい以前にそもそもサービス提供できてないという国のよくわからんサービスの方が使い勝手ましですね

000

yoshi-taka @ask-yoshi-taka.bsky.social · 09/07/2026

Practical AWS FinOps: Cost Management from Unit Economics to Optimization - First Steps: Democratization - Clarify Unit Economics - Amortization & Showback - Grasp the Request Cost Structure - Understand the Bill Details - Budget Management & Continuous Forecasting veritycost.com/en/posts/aws...

veritycost.com

Practical AWS FinOps: Cost Management from Unit Economics to Optimization

A comprehensive guide to AWS cost management and FinOps — covering data democratization, unit economics, showback, daily operations, and cost reduction strategies.

000

yoshi-taka @ask-yoshi-taka.bsky.social · 26/06/2026

はよイーロンマスクがx手放してほしいですねそれか法律作り規制するか

000

yoshi-taka @ask-yoshi-taka.bsky.social · 03/06/2026

Fewer SaaS companies than expected actually managing AWS unit economics rigorously? Even amortization often seems missing. Maybe Finance doesn’t fully understand engineering, engineering doesn’t fully understand Finance. Tight collaboration just feels like too much hassle for both sides.

100

yoshi-taka @ask-yoshi-taka.bsky.social · 26/05/2026

mmntjs/fns is now faster than date-fns, and in some cases even faster than Temporal. Performance optimization is oddly fun when you own the codebase and can just change the hot path yourself.

000

yoshi-taka @ask-yoshi-taka.bsky.social · 19/05/2026

現在外資なのでbenevityでTansaに寄付してみたら英語のお礼メールが来たのでおおうと思いました日本語コミュニケーションの重要性を感じる(なぞ

000

yoshi-taka @ask-yoshi-taka.bsky.social · 06/05/2026

The AI agent keeps bypassing the commit hooks.

000

yoshi-taka @ask-yoshi-taka.bsky.social · 04/05/2026

When CI gets slow or costs creep up: bunx ci-perf-lint npx ci-perf-lint CI Perf Lint audits your repo and tells you what to fix first with AI-ready instructions. ci-perf-lint.veritycost.com e.g. drizzle-orm

000

yoshi-taka @ask-yoshi-taka.bsky.social · 27/04/2026

Also, I’m building a CI performance lint that statically analyzes workflows and surfaces wasted time and compute, with deterministic findings and fix hints across the entire pipeline from build and test to deploy.

000

yoshi-taka @ask-yoshi-taka.bsky.social · 27/04/2026

I’m building a drop-in replacement for moment, designed as a migration path to Temporal.

000

Reposted by yoshi-taka

繻鳳花@shuhohka @shuhohka.bsky.social · 15/04/2026

西洋ファンタジー世界でもよく登場する羽ペンについて、中世と近世、近代で使い方が多少異なります。ファンタジー世界では羽毛をほとんどつけたままの状態で描かれることが多いのですが、実際に書く時、握り手の部分にひっかかって羽の部分が邪魔になります。そのため中世のように羽は一部を除いてむしってしまった方が実質的に使いやすいです。またペン先は使い続けると割れてしまうことがあるのですが、その際はナイフなどで先端を少し切れば再び書けるようになります。同じ羽ペンでも時代によって形が少しずつ変わっていくのもまた味があっていいのかなと思います。（画像：羊皮紙工房公式サイトより）

017172

yoshi-taka @ask-yoshi-taka.bsky.social · 14/04/2026

For now, approach AI with a trader’s mindset. Be ready to reverse course and avoid overcommitting. The space is fast-moving and fluid, with little durable accumulation. Try things, switch quickly, and discard what doesn’t fit.

010

yoshi-taka @ask-yoshi-taka.bsky.social · 14/04/2026

Time to first AI prompt has become a new onboarding metric for new hires. This actually matters.

000

yoshi-taka @ask-yoshi-taka.bsky.social · 08/04/2026

Measuring the impact of AI is hard. Of course, we have to design with the full understanding that token metrics are largely meaningless. Outputs and outcomes aren’t easy to capture as data, and even when they are, they’re not something you can quickly act on.

000

yoshi-taka @ask-yoshi-taka.bsky.social · 07/04/2026

I’m a big fan of dependency reduction efforts like e18e. But in practice, replacing small dependencies safely is still harder than it should be. Package Replacement is a copy-paste registry for npm dependencies. package-replacement.veritycost.com

package-replacement.veritycost.com

Package Replacement

Copy useful package behavior into your repo.

100

yoshi-taka @ask-yoshi-taka.bsky.social · 04/04/2026

I built MCP Static Context Index, a public benchmark of MCP server static context cost. Too many MCP servers are still far too heavy. This shows which ones are lightweight, which are heavy, and whether the weight comes from instructions, tool definitions, or schemas mcpindex.veritycost.com

mcpindex.veritycost.com

MCP Static Context Index

Measure static exposure. Compare the heaviest servers. Show which vendors actually reduce context.

010

yoshi-taka @ask-yoshi-taka.bsky.social · 24/03/2026

new post Including initiatives like e18e, reducing dependencies is a highly valuable practice. I’m a big fan of e18e. That said, the path is not easy. The fact that many repositories still rely on jest makes this quite clear. veritycost.com/en/posts/why...

veritycost.com

Why Dependency Reduction Is Still Hard

Dependency reduction improves performance, security, and maintainability, but it’s harder than it looks. This article explores why and how to tackle it in practice.

020

yoshi-taka @ask-yoshi-taka.bsky.social · 22/03/2026

Code is the script. Behavior is the performance.

000

Reposted by yoshi-taka

Ed Zitron @edzitron.com · 17/03/2026

Free newsletter: Why're we still doing this? Despite $1tr+ in investment, every AI company is unprofitable, LLMs have yet to provide tangible productivity benefits, and private credit-backed data center debt may be the next great financial crisis. www.wheresyoured.at/why-are-we-still-doing-this/

wheresyoured.at

Why Are We Still Doing This?

Hi! If you like this piece and want to support my work, please subscribe to my premium newsletter. It’s $70 a year, or $7 a month, and in return you get a weekly newsletter that’s usually anywhere fro...

19799222

yoshi-taka @ask-yoshi-taka.bsky.social · 22/01/2026

Monthly reflection based on ChatGPT conversations (using built-in tasks, no external tools)

000

yoshi-taka @ask-yoshi-taka.bsky.social · 13/01/2026

Moved my blog. veritycost.com The domain and name are pretty arbitrary. Relying on hosted blog services is fragile. Owning it yourself is the most stable option. Kept it simple: Astro + Cloudflare Pages. Migrating the posts was one thing, but tuning it as an actual blog still took a few hours.

veritycost.com

ask_yoshi_taka Blog

Notes and essays by ask_yoshi_taka.

000

yoshi-taka @ask-yoshi-taka.bsky.social · 28/11/2025

When working with AI, including coding agent, knowing when to cut your losses is key. It’s probabilistic, so when things don’t go well, quitting early saves you. Keep pushing and you’ll spiral into wasted time and effort. Practice with stock trading if you need to get better at that skill🫠

020

yoshi-taka @ask-yoshi-taka.bsky.social · 17/11/2025

In Python 3.14, io.DEFAULT_BUFFER_SIZE was bumped to 128 KiB. Love this change for I/O performance. github.com/python/cpyth...

010

yoshi-taka @ask-yoshi-taka.bsky.social · 15/11/2025

node.js 24 lambda github.com/aws/aws-cdk/...

000

yoshi-taka @ask-yoshi-taka.bsky.social · 15/11/2025

It seems people are often more hesitant to change development tooling than production code, even when the change is small. It does add a bit of extra work, after all. That’s why the development environment in a repository can stay unchanged for a surprisingly long time.

000

yoshi-taka @ask-yoshi-taka.bsky.social · 09/11/2025

Pinning package versions is ideal from a security perspective, but it makes module duplication even worse. Tough trade-off. If you maintain cleanly-separated internal packages, a catalog is pretty much mandatory. Still, the blast radius grows either way… there’s no easy path.

000

yoshi-taka @ask-yoshi-taka.bsky.social · 15/10/2025

If Bun could generate PDFs, it could replace many use cases that currently rely on Puppeteer.

000

yoshi-taka @ask-yoshi-taka.bsky.social · 04/10/2025

In macOS Tahoe, window resize cursors have become easier to see. Love this change!

000

yoshi-taka @ask-yoshi-taka.bsky.social · 29/09/2025

In my tests, `bun run script` runs faster than `node --run script`.

000

Reposted by yoshi-taka

繻鳳花@shuhohka @shuhohka.bsky.social · 24/09/2025

東京・羽田空港第一ターミナルにあったフードコートがリニューアルされ、イタリア・フィレンツェの有名ジェラート店「Badiani（バディアーニ）」が新規出店していたので伺いました。店員さんに勧められたのが「ブォンタレンティ」というミルクテイストのジェラートだったのですが、説明を見てみると16世紀頃に誕生したレシピが元、とのことで大変興味をもちました。後日簡単に調べてみたのですが、16世紀頃の芸術家・ベルナルド・ブオンタレンティが考案したとされ、のちに彼の活動を支援していたメディチ家の計らいで自国以外にもそれシピを伝授したとされます。とても濃厚かつシンプルな味でした。お立ち寄りの際はぜひに。

Badiani 羽田空港第1ターミナルビル店
営業時間：10:00～20：00
羽田空港第1ターミナルB1F「Sora chika」内（フードコート左側にあります）

04617

yoshi-taka @ask-yoshi-taka.bsky.social · 25/08/2025

Aurora has no instance-level deletion protection. With cluster deletion protection, the console blocks removal of the last instance, but the DeleteDBInstance API will still delete it. Cluster-level protection helps, but when using IaC you should be careful. #aws

000

yoshi-taka @ask-yoshi-taka.bsky.social · 14/08/2025

000