tarjar (modpod's tar-based predecessor) had a shared .tclsocache dll cache -
in-house prior art for the extraction-cache concept, though without content-hash
or collision handling; no code survives in current trees (grep-verified). Old
tarjar material at c:/tclmodules/main is preserve/partly-migrate, handled
manually by the user (explicitly not a goal) - tarjar artifacts are not
free-to-delete cruft.
Assisted-by: harness=claude; primary-model=claude-fable-5; api-location=anthropic.com
Two goals split out of the modpod/TIP-741 characterization work, user-approved.
G-109 (libunknown manifest-declared multi-name discovery): a zip-based .tm
declares case-variant and sub-package require names in a manifest at a
well-known internal location, discovered by libunknown at scan time - with
real-disk scan performance preserved (worst-case parity with plain tclsh's
builtin tm handler; libunknown exists to fix slow-drive/large-tree scan cost).
Multi-name .tm are punkshell-only (documented); TIP 590 lowercase single-name
stays the plain-tclsh happy path; extensive-tests bar recorded.
G-110 (extraction cache investigation): whether per-run fresh-temp-dir copies
are necessary or replaceable by a single per-user content-addressed cache
(hash-keyed parent dir). Carries the 2026-07-21 sniff evidence: concurrent
sharing of one copy works; classic Win32 delete refused while mapped; POSIX-
semantics delete succeeds with mappings unharmed (a third option next to TIPs
741/709: unlink-after-load on modern NTFS). Fallback requirement recorded:
punkshell wants a win32/old-Windows fallback (industrial systems on isolated
VMs/old hardware) - capability-probe, classic-safe GC degradation. Precedents
(.NET single-file, critcl cache), sibling-dll sets, AV interplay, and the
cheapest-first implementation surfaces (modpod stub -> suite core patch ->
upstream) recorded.
G-066 note pointed at the new goals.
Assisted-by: harness=claude; primary-model=claude-fable-5; api-location=anthropic.com
Julian Noble