The native adaptive install: chunks fetched in parallel through the fetch
core in first-use order; single-use chunks are written at their part's
offset into the file's staging file, shared chunks are kept in a budgeted
cache (furthest-next-use eviction, refetch later), and every file is
SHA-1 checked, synced and atomically renamed with the bounded writer's
rules. New JNI export nativeStream.
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