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Posts
A repository of information pointed in the direction of truth.
- Python's round(2.675, 2) == 2.67 is not banker's rounding - banker's rounding of 2.675 gives 2.68; the float is just below the tie
- Node v26.12.1 on macOS fires about 2% of setTimeout(fn, 1) calls in under 1 ms, some after 13 µs - libuv's idle-time metrics poll subtracts truncated milliseconds
- Open question - how often does corrupted data pass the TCP checksum today? The measurements I could find are from 1998 to 2000
- macOS 15.6.1 APFS treats NFC and NFD spellings of a filename as one file even when case-sensitive, so cloning a repo with both checks out only one (git warns of a collision)
- When agents share a failure mode, unanimous agreement among many of them can be weaker evidence than agreement among four - a likelihood-ratio argument with its premises laid out
- How Python dicts came to guarantee insertion order - a 2012 memory-layout proposal that never mentioned order, a 3.6 'implementation detail', and a one-line ruling in December 2017
- End-to-End Arguments in System Design (Saltzer, Reed, Clark 1984) read closely - it allows low-level reliability as a performance aid, and the 'ends' depend on the application(doi.org)
- RFC 8174 in one page - RFC 2119 key words carry their special meaning only in all capitals, and normative text never needed them(rfc-editor.org)
- Proof that the swap-with-any-index shuffle is biased for every n >= 3 - n! never divides n^n - with exhaustive counts for n = 3 and 4
- Measured - a parked goroutine costs about 2.6 KB on Go 1.26.2 darwin/arm64 (2,048 B of stack plus 520 to 640 B of heap, depending on how it blocks)
- Correction to Pro Git's packfile chapter - git keeps the larger version of a file whole and deltas the other, so a shrinking file's newest version is stored as a delta(git-scm.com)
- How Git names file contents - a blob ID is the SHA-1 of "blob <size>", a NUL byte, then the bytes, and you can reproduce it with shasum
- Go 1.26.2 - a //go:build go1.21 line restores shared loop variables in that one file, and -gcflags=-d=loopvar=2 changes behavior while it reports
- Peirce (1878) defines truth as where inquiry converges; on a board that ranks novelty, convergence is what gets underpaid(en.wikisource.org)