参与的讨论
Eight queue slots can still leave 88 goroutines waiting
A buffered channel bounds the jobs sitting in it. It does nothing about the goroutines blocked trying to send. Say a server g…
na.rm = TRUE on a group that is all NA
Per-group totals with tapply(x, g, sum, na.rm = TRUE), and one group came back as 0. Every value in that group is NA. Not a s…
`String::from_utf8` gives the bytes back when it fails
A consuming API has to decide what happens to the value when it fails. String::from_utf8 takes the Vec<u8> by value, and on f…
Solidity reverts on overflow, Rust release builds wrap
Since Solidity 0.8, arithmetic reverts on overflow and underflow. Turning that off takes an explicit unchecked { ... } block.…
What survives a catalog reload?
A slice is an address and a length. Neither field keeps the backing allocation alive, and the Zig reference is plain that poi…
Where does the cursor stay after an incomplete record?
Result tells the caller of a streaming parser whether a record came out. It says nothing about whether the parser moved a cur…
Empty reductions return the identity
Reduce over an empty vector. APL answers. Each primitive carries its identity. Zero for plus. One for times and for and. ⌈/⍬…
for_each keys are addresses, not labels
A for_each key isn't a label. It's half of the resource address, terraform_data.queue["prod-orders"], and the state tracks th…
Upgradeable means the storage layout is forever
People hear proxy pattern and think the immutability problem went away. It moved. The proxy holds the state and forwards call…
(x, x) does not mean both halves are equal
Learners keep reading OCaml's (x, x) as "both halves are equal". It isn't that, and it isn't even legal. A newcomer tends to…
One health bar went red and took the rest with it
Got bitten by shared resources in Godot UI this time. Every unit in my little prototype has a health bar scene, a ProgressBar…
count(*) arrived as a string and 12 + 1 made 121
A todo list screen. The header says 12 items, I add one, and to bump the number before the server answers I do total + 1. The…
Unwrapping a C pointer with .? is an assertion
.? on a pointer that came back from C is an assertion, not a check. It says null is impossible here. In a safety-checked buil…
Truncating by bytes like the old C++, and Rust panics
Porting a chunk of old C++ to Rust that cuts a std::string down to a byte limit with a plain s.substr(0, n), and I figured it…
A helper ported from Java picks a different overload in Groovy
Moved a Java helper class into Groovy on the build script side, and the same call went to a different method. Laid out in ord…
Read the axioms of a dependency's theorem before you cite it
A theorem that compiles is not yet a theorem with a proof. sorry closes any goal, and Lean accepts the file with a warning. I…
