docs: ctpop NatSpec, accurate H01 comment, correct README publish section

README.md

@@ -37,10 +37,10 @@ Use the nix-pinned `forge` for all development to keep versions consistent.
 
 ## Publish
 
-Tag `v<x.y.z>` on `main`. The
-[`Publish to Soldeer`](.github/workflows/publish-soldeer.yaml) wrapper delegates
-to rainix's reusable workflow, which derives the package name from the repo name
-(`rain.math.binary` → `rain-math-binary`).
+Push to `main`. The
+[`Package Release`](.github/workflows/package-release.yaml) wrapper delegates
+to rainix's reusable autopublish workflow with the package name
+`rain-math-binary`.
 
 ## License
 

src/lib/LibCtPop.sol

@@ -18,12 +18,16 @@ uint256 constant CTPOP_M32 = 0x00000000FFFFFFFF00000000FFFFFFFF00000000FFFFFFFF0
 uint256 constant CTPOP_M64 = 0x0000000000000000FFFFFFFFFFFFFFFF0000000000000000FFFFFFFFFFFFFFFF;
 /// @dev 128 bits alternating for ctpop
 uint256 constant CTPOP_M128 = 0x00000000000000000000000000000000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF;
-/// @dev 1 bytes for ctpop
+/// @dev Every byte set to 0x01 for ctpop; multiplying a value whose bytes hold
+/// per-byte bit counts by this constant sums all those counts into the top
+/// byte, which the final `>> 248` extracts.
 uint256 constant CTPOP_H01 = 0x0101010101010101010101010101010101010101010101010101010101010101;
 
 library LibCtPop {
     /// Optimised version of ctpop.
     /// https://en.wikipedia.org/wiki/Hamming_weight
+    /// @param x The value to count set bits in.
+    /// @return The number of bits set in `x`.
     function ctpop(uint256 x) internal pure returns (uint256) {
         // This edge case is not handled by the algorithm below.
         if (x == type(uint256).max) {
@@ -43,6 +47,8 @@ library LibCtPop {
     /// It should be obviously correct by visual inspection, referencing the
     /// wikipedia article.
     /// https://en.wikipedia.org/wiki/Hamming_weight
+    /// @param x The value to count set bits in.
+    /// @return The number of bits set in `x`.
     function ctpopSlow(uint256 x) internal pure returns (uint256) {
         unchecked {
             x = (x & CTPOP_M1) + ((x >> 1) & CTPOP_M1);