web: bits per weight uses goFixed

web/src/run.js

@@ -561,8 +561,9 @@ function summaryLine(idx) {
 
 // Bits per weight as the card would print it: two decimals at most, and a
 // figure like 6.5625 (a real UD-Q6_K measurement) does not pretend to four.
+// The tie is goFixed. toFixed would print 6.125 as 6.13.
 function bits(b) {
-  return Number(b).toFixed(2).replace(/\.?0+$/, "");
+  return goFixed(Number(b), 2).replace(/\.?0+$/, "");
 }
 
 // The figure rows (TTP-130). Every part is copied from the index the client

web/test/gofixed.test.mjs

@@ -8,6 +8,7 @@ import test from "node:test";
 
 import { fmt } from "../src/page.js";
 import { goFixed } from "../src/gofixed.js";
+import { serveRunPage } from "../src/run.js";
 
 test("an exact tie rounds to even, as Go does", () => {
   assert.equal(goFixed(0.25, 1), "0.2");
@@ -24,6 +25,39 @@ test("fmt uses that tie rule for the figures the page shares with the card", ()
   assert.equal(fmt(0), "?");
 });
 
+test("bits per weight uses that tie rule and keeps at most two decimals", async () => {
+  const row = {
+    id: "abcdefgh",
+    created_at: "2026-09-19T07:00:00Z",
+    private: 0,
+    owned: 1,
+    card_key: null,
+    tape_ext: ".toktape",
+    tape_bytes: 100,
+  };
+  async function quant(bits) {
+    const env = {
+      DB: {
+        prepare: () => ({
+          bind: () => ({
+            first: async () => ({
+              ...row,
+              index_json: JSON.stringify({ schema: 1, quant_raw: "Q6_K", quant_bits: bits }),
+            }),
+          }),
+        }),
+      },
+    };
+    const html = await (await serveRunPage("abcdefgh", env, "https://tape.midagedev.com")).text();
+    const cell = /quantisation<\/td><td class="v mono">([^<]*)/.exec(html);
+    assert.ok(cell, "no quantisation row");
+    return cell[1];
+  }
+  assert.equal(await quant(6.5625), "Q6_K · 6.56 bit");
+  assert.equal(await quant(6.125), "Q6_K · 6.12 bit");
+  assert.equal(await quant(4.5), "Q6_K · 4.5 bit");
+});
+
 test("a value that only looks like a tie rounds by its exact value", () => {
   // 0.15 and 1.45 are stored just under the tie (0.1499…, 1.4499…): Go prints 0.1 and 1.4.
   assert.equal(goFixed(0.15, 1), "0.1");