Every article ships with something you can drag, break and rebuild — performance, accessibility, market data, free tooling.https://zlimn.com/enhttps://zlimn.com/en/bcrypt-72-byte-limit/https://zlimn.com/en/bcrypt-72-byte-limit/Two passwords that look nothing alike can be the same password. The cut is measured in bytes, not characters, so it lands mid-character — and 24 Chinese characters is already the whole budget.Fri, 07 Aug 2026 00:00:00 GMThttps://zlimn.com/en/esm-cjs-interop-node-25/https://zlimn.com/en/esm-cjs-interop-node-25/require() of an ESM module works now, and TypeScript no longer complains either. What still breaks is the dual package hazard — and it fails as instanceof returning false, not as an error.Fri, 07 Aug 2026 00:00:00 GMThttps://zlimn.com/en/pandas-3-silent-change/https://zlimn.com/en/pandas-3-silent-change/Everyone is fixing SettingWithCopyWarning. That one never worked anyway. The write that works today and silently stops working under Copy-on-Write does not emit a warning in either version.Fri, 07 Aug 2026 00:00:00 GMThttps://zlimn.com/en/duckdb-silent-nulls/https://zlimn.com/en/duckdb-silent-nulls/DuckDB is famously forgiving, and that is the problem. Four everyday operations hand back a wrong answer with no warning — including one where count(*) succeeds and SELECT * crashes on the same file.Thu, 06 Aug 2026 00:00:00 GMThttps://zlimn.com/en/free-postgres-tiers/https://zlimn.com/en/free-postgres-tiers/Neon, Supabase and Render all say "free". One sleeps your compute, one pauses your project, and one expires the database 30 days after you create it and then deletes it.Thu, 06 Aug 2026 00:00:00 GMThttps://zlimn.com/en/github-actions-free-minutes/https://zlimn.com/en/github-actions-free-minutes/Same builds, same minutes, same everything — but the runner you picked changes the bill by a factor of ten. And two settings take it to zero.Thu, 06 Aug 2026 00:00:00 GMThttps://zlimn.com/en/microbenchmark-traps/https://zlimn.com/en/microbenchmark-traps/Same code, same machine, opposite conclusions. Warmup, dead-code elimination and input size each decide the winner — and benchmark posts almost never say where they set them.Thu, 06 Aug 2026 00:00:00 GMThttps://zlimn.com/en/node-erasable-typescript/https://zlimn.com/en/node-erasable-typescript/Type stripping is on by default and it does not compile, it deletes. Five constructs have no runtime-free equivalent to delete, and each one stops your process at startup.Thu, 06 Aug 2026 00:00:00 GMThttps://zlimn.com/en/realtime-chart-append-jank/https://zlimn.com/en/realtime-chart-append-jank/Appending each tick to a growing array looks fine for the first ten seconds. Measured at 3,000 ticks per second, it blows the frame budget at around 55 and goes superlinear after that.Thu, 06 Aug 2026 00:00:00 GMThttps://zlimn.com/en/candlestick-red-green-conventions/https://zlimn.com/en/candlestick-red-green-conventions/Candlestick charts encode direction in three independent conventions, and every charting library ships the Western default. Half your readers are reading the opposite chart.Wed, 05 Aug 2026 00:00:00 GMThttps://zlimn.com/en/chart-library-performance-large-datasets/https://zlimn.com/en/chart-library-performance-large-datasets/The gap between ECharts, Highcharts and Chart.js is usually under 2x. The gap between SVG and canvas is a different shape entirely — one grows with your data, the other does not.Wed, 05 Aug 2026 00:00:00 GMThttps://zlimn.com/en/color-blind-safe-chart-palettes/https://zlimn.com/en/color-blind-safe-chart-palettes/Most charting libraries pick their default colours for hue variety. Hue is exactly what red-green colour blindness takes away, which is why the defaults fall apart.Wed, 05 Aug 2026 00:00:00 GMThttps://zlimn.com/en/render-million-point-time-series/https://zlimn.com/en/render-million-point-time-series/The bottleneck is almost never the chart library. It is the number of draw calls you hand the browser, and there are three ways to cut it.Tue, 04 Aug 2026 00:00:00 GMT