The opcache file cache the pack ships, written by scripts/bake-opcache.ts; undefined when none
was baked (the pack arm then mounts nothing). systemId is opcache's per-build directory, so
a cache from another binary is never read; source is opcacheSourceKey() at bake time.
The opcache file cache the pack ships, written by
scripts/bake-opcache.ts; undefined when none was baked (thepackarm then mounts nothing).systemIdis opcache's per-build directory, so a cache from another binary is never read;sourceisopcacheSourceKey()at bake time.