Investigate aggressive methodCodeHashSignatures invalidation in com-lihaoyi/mill

[lihaoyi]

The following diff seems to invalidate stuff throughout the codebase, rather than just in integration/ and example/ which is what I would expect. Worth looking into whether it's correct behaviour or not

lihaoyi mill$ git diff
diff --git a/integration/package.mill b/integration/package.mill
index 4268947e76..704070f88a 100644
--- a/integration/package.mill
+++ b/integration/package.mill
@@ -47,7 +47,7 @@ object `package` extends RootModule {
           Map(
             "MILL_INTEGRATION_SERVER_MODE" -> (mode == "local" || mode == "server").toString,
             "MILL_LAUNCHER" -> build.dist.bootstrapLauncher().path.toString,
-            "MILL_LAUNCHER_BAT" -> build.dist.bootstrapLauncherBat().path.toString,
+            "MILL_LAUNCHER_BAT2" -> build.dist.bootstrapLauncherBat().path.toString,
           ) ++
           testReleaseEnv()

[lihaoyi]

Seems to be caused by non-deterministic classfile contents, maybe related to scala/scala3#22181.

[lihaoyi]

Seems the module reference forwarders for sub-folder package.mill files are generated in non-determinstic orders