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fasterthanli.me
amos
@fasterthanli.me
13K followers 410 following 3.1K posts
hi, I'm amos! 🍃 they/them 🫐 open-source witch & maker of snappy videos and articles at @bearcove.eu ✨ be kind, be curious

articles: https://fasterthanli.me
videos: https://youtube.com/@fasterthanlime
podcast: https://sdr-podcast.com
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fasterthanli.me
really nice to get LSP support for spec annotations 😌

(and jump to implementations, rename, etc. — you know. lsp.)
some rust code, in comments `r[impl streaming.type]` is highlighted because it's "orphaned" (no rule definition exists for them)
January 11, 2026 at 9:58 AM
fasterthanli.me
logan: we're sponsoring tailwindcss!
the community of builders:
Bob the builder looking sad
January 9, 2026 at 9:38 AM
fasterthanli.me
babe wake up they invented carbon offset for AI
It's a tweet from Logan Kilpatrick saying I am happy to share that we, the Google AI Studio Team, are now a sponsor of the Tailwind CSS project. Honored to support and find ways to do more together to help the ecosystem of builders.
January 9, 2026 at 9:36 AM
fasterthanli.me
docs.rs/crate/idna_a...

fucking what
I don't know, it's just a ramble from the docs saying that you should update precise to an older version if you don't actually want to use ICU4X.
January 3, 2026 at 8:03 PM
fasterthanli.me
been building a few TUIs lately and that one was misbehaving, and... well, a screen recording is a tool you should never underestimate (this error was present for 1 frame)
A screenshot of a tool called E2E Runner that shows various things in progress. And at the bottom there's an exception, says the application panicked, crashed, byte index 47 is not a car boundary, it is inside some Unicode character. Various tasks being done are Docker, build packages, build bear shop, migrations, seed Medusa, build storefront, storefront playwright.
January 3, 2026 at 6:02 AM
fasterthanli.me
working on new merch (/s)
a white t-shirt that says "type punning isn't funny"
December 31, 2025 at 5:36 PM
fasterthanli.me
I see the React port is going well
a github issue page where it just says Error, looks like something went wrong
December 31, 2025 at 12:07 PM
fasterthanli.me
✨
+20 -103,080 (diff-style)
December 29, 2025 at 8:53 PM
fasterthanli.me
who would win? 12 work threads across as many tmux sessions?

or ___BUG_IN_CLIENT_OF_LIBMALLOC_POINTER_BEING_FREED_WAS_NOT_ALLOCATED
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 libsystem_kernel.dylib 0x18bebf5b0 __pthread_kill + 8 1 libsystem_pthread.dylib 0x18bef9888 pthread_kill + 296 2 libsystem_c.dylib 0x18bdfe850 abort + 124 3 libsystem_malloc.dylib 0x18bcfd224 malloc_vreport + 892 4 libsystem_malloc.dylib 0x18bd00f78 malloc_report + 64 5 libsystem_malloc.dylib 0x18bd05e04 ___BUG_IN_CLIENT_OF_LIBMALLOC_POINTER_BEING_FREED_WAS_NOT_ALLOCATED + 76 6 tmux 0x10408f1f0 grid_free_line + 44 7 tmux 0x10408fd20 grid_clear_lines + 120 8 tmux 0x1040af8f0 screen_reinit + 164 9 tmux 0x1040d1808 window_copy_clone_screen + 216 10 tmux 0x1040cff38 window_copy_init + 72 11 tmux 0x1040e1278 window_pane_set_mode + 188 12 tmux 0x104067e00 cmd_copy_mode_exec + 284 13 tmux 0x1040731d8 cmdq_next + 844 14 tmux 0x1040b96a8 server_loop + 80 15 tmux 0x1040a7d44 proc_loop + 68 16 tmux 0x1040b912c server_start + 600 17 tmux 0x104065190 client_main + 1040 18 tmux 0x1040c1f84 main + 2032 19 dyld 0x18bb31d54 start + 7184
December 29, 2025 at 6:50 PM
fasterthanli.me
great, now there's /two/ numbers I have to get to 100%

github.com/bearcove/tra...
A screenshot of the traceability matrix as produced by the TRACE tool with 41 total rules, 97.6% implementation coverage and 46.3% test coverage. There's a bunch of rules that have an identifier. If you click the identifier, it opens the markdown file in your editor. And then there are references on the right. Implementation references have a little code icon. is also off screen we don't really see them, there's test references and everything Everything is nicely structured and everything. It's using public sands and IBM Plex Mono. It's very tasteful if I say so myself.
December 29, 2025 at 2:14 PM
fasterthanli.me
what's your readme language of choice? markdown? rst? aasciidoc?

why not non-syntax-highlighted-rust?
It's a screenshot of a GitHub repository. There is a folder with a readme.rs file. And so GitHub is rendering it as a readme without colors.
December 29, 2025 at 12:22 PM
fasterthanli.me
MORE CI! MORE JOBS! MORE WINE
The current CA pipeline for my RPC project, RAPAS, it now has... I don't know how to count, but it has a bunch of tests for Rust, like tests on Linux and Mac, browser WebSocket tests, FuzzSmoke tests, Clippy format documentation, Miri, Loom, code coverage, conformance, TypeScript tests for unit tests and conformance, Swift tests for unit tests and conformance, and spec rule coverage.
December 29, 2025 at 12:10 PM
fasterthanli.me
pikru (my Rust port of pikchr) now matches pikchr-c for all 106 tests.

pikru.bearcove.eu ✨
December 28, 2025 at 12:41 PM
fasterthanli.me
Joyeuse Année 2025
a screenshot from an email sent by the "finances publiques" in France with mojibake
December 28, 2025 at 11:30 AM
fasterthanli.me
hi, claude successfully ported aasvg to rust so I can use it in dodeca

github.com/bearcove/aas...

it has zero deps and produces the exact same output enjoyyyy

(except mine has light-dark support)
A screenshot of the README of AASVG, which is showing all the different ASCII things that it can turn into SVG.
December 27, 2025 at 6:43 PM
fasterthanli.me
today's lesson:

copies are cheap
hashing is expensive
Table displaying the results of a benchmark for hashmaps with four stages: "Before any optimization" with a time of 101 microseconds, "After string optimization" with 92.5 microseconds, "After collector pattern" with 57.8 microseconds, and the "serde_json baseline" with 88 microseconds. The column shows the performance comparison against serde_json, indicating a total improvement of 43% faster.
December 27, 2025 at 9:14 AM
fasterthanli.me
you /could/ get a free maxminddb license

or you could:
download it from a weird JS package from cdn.jsdelivr.net
December 25, 2025 at 2:59 PM
fasterthanli.me
*sigh*
part of the select macro for tokio
December 24, 2025 at 2:41 PM
fasterthanli.me
what's nice about my life r/n is that if I see ONE bad diagnostic I have the power to go ballistic on it and end up with something like this: (big up to miette, marries so well with the facet ecosystem).

in this house we love agency
a detailed view of why exactly serialization failed, via 4 different types, using miette so it highlights which field failed etc.
December 23, 2025 at 8:32 AM
fasterthanli.me
...does it? does it really?
A bar graph of GLM 4.7 versus GLM 4.6 in real-world development scenarios. It's broken down as win-tie-lose. In frontend, the new one wins 64% of the time, in backend it wins only 46% of the time, and in instruction following it wins 58% of the time. It just feels like a crapshoot, you know? It feels like 50-50.
December 22, 2025 at 6:52 PM
fasterthanli.me
AHHHHHHHHHH
CI GREEN
December 21, 2025 at 4:27 AM
fasterthanli.me
pikchr port to rust is doing well ✨
69%, 70/102 passing
December 20, 2025 at 9:38 AM
fasterthanli.me
??? see what I mean
one reply saying I love the terminal, another saying I hate it so much
December 19, 2025 at 1:10 PM
fasterthanli.me
I'm gonna miss GitHub Actions' little graphs when it's time to move on
the CI.yml actions graph for GitHub actions with the build binary and then build cells, six different jobs in two different blocks that each go to assemble for Linux and Mac, then to integration for Linux and Mac, then they converge into release.
December 18, 2025 at 8:14 AM
fasterthanli.me
GitHub Actions charging per build minute for *self-hosted-runners*? Shit's about to hit the fan lol
You are receiving this email because your usage of GitHub Actions may be impacted by upcoming changes to GitHub Actions pricing. What’s changing, when On January 1, 2026, all customers will receive up to a 39% reduction in the net price of GitHub-hosted runners, depending on the machine type used. On March 1, 2026, we are introducing a new $0.002 per-minute GitHub Actions cloud platform charge that will apply to self-hosted runner usage. Any usage subject to this charge will count toward the minutes included in your plan. No action is required on your part.
December 16, 2025 at 5:55 PM