The patched pool's module fallback service handles /@fs ids with posix
assumptions, so Windows drive-letter paths (/@fs/C:/...) fall through and
raw-text modules fail to resolve before any test runs. The purity guard is
platform-independent — the bundle graph proven inside a Linux isolate is the
same graph everywhere — so the suite skips on win32 rather than teaching the
pinned pool about windows paths.
Kit Langton
c0dc8c326a