Compare 1.x with main now that the value type is merged

Claude-Session: https://claude.ai/code/session_01K5Bk9UjGdGUtC5C6qK5ZxD

Author: matt-edmondson

.github/workflows/benchmark-ab.yml

@@ -1,6 +1,6 @@
 name: Benchmark A/B
 
-# Temporary. Runs main and precise-number-value-type in one job on one machine, so the two
+# Temporary. Runs 1.x (cd9a822, main just before the value type merge) and main in one job on one machine, so the two
 # sets of timings are comparable. Separate workflow runs can land on different CPUs. Delete
 # this branch once the run finishes.
 on:
@@ -18,16 +18,16 @@ jobs:
     timeout-minutes: 240
 
     steps:
-      - name: Checkout main
+      - name: Checkout 1.x (cd9a822)
         uses: actions/checkout@v7
         with:
-          ref: main
+          ref: cd9a822
           path: a
 
-      - name: Checkout precise-number-value-type
+      - name: Checkout main (2.x)
         uses: actions/checkout@v7
         with:
-          ref: precise-number-value-type
+          ref: main
           path: b
 
       - name: Setup .NET SDK