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A comment on Buz – A fork of Bun using modern Zig, with sub-1s incremental builds. Parent comment

Re:Buz – A fork of Bun using modern Zig, with sub-1s increme... by Dylan16807 on Saturday July 25, 2026 @12:21AM (#49044496)
I'm optimistic for that refactoring. But if one in 30 lines sprinkled all over everywhere is unsafe then you haven't actually done much to improve safety. When you have a large percent of fully safe functions and modules, that's when you're making a difference. Counting the lines is not a very helpful metric.
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Re:Buz – A fork of Bun using modern Zig, with sub-1s increme... by skeledrew on Saturday July 25, 2026 @08:24PM (#49053294)
> one in 30 lines

> Counting the lines is not a very helpful metric.

Seems self-contradictory.

And they did say they're working to reduce the unsafe code over time. That huge percentage of memory bugs that they were able to better triage and fix due to the port was also them improving safety.

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Re:Buz – A fork of Bun using modern Zig, with sub-1s increme... by Dylan16807 on Saturday July 25, 2026 @08:35PM (#49053366)
The other part of that line is important. Measuring lines is better than nothing but the distribution is much more important. If they're scattered all over that's a bigger downside than the line reduction is an upside.

If you want good metrics, measure functions and data structures without unsafe. Not lines.

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Re:Buz – A fork of Bun using modern Zig, with sub-1s increme... by skeledrew on Saturday July 25, 2026 @09:04PM (#49053556)
> If you want good metrics, measure functions and data structures without unsafe.

I doubt it, as it's possible a substantial amount of those unsafe areas can't even be removed, given the project's dependent on C/C++ libraries. Without proper calibration those metrics won't tell the full story, and with calibration the incentive for the story will decrease over time with the unsafe refactoring. I doubt the distribution of the unsafe code really matters that much; what matters is proper handling, wherever it is, so stability and security isn't compromised.

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