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The checkpoint's table still said the document and scalar apps were not
one authorable model, and that equivalent-server latency was unproven.
A new section records what has been checked since: one app model (aup to
module format v5), persistence, Vega's surfaces and hot swap, apps as
HTTP services, and the measurements against axum and drogon, with what
remains. The README opens with the same in brief.
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The recorded Raspberry Pi 5 (Linux AArch64, 16 KiB pages, ext4) replaces
Apple Silicon macOS as the device whose results decide completion. The macOS
CI job stays as an optional portability check; no macOS support is claimed.
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state.h gives any app a runtime-owned working version of a stored value on
the tree store. A draft shares unchanged extents with the stored version,
edits in memory by path copying, lends ordered extents without copying, and
commits only its new nodes when the key is still at its base revision. A
failed commit changes neither the draft nor the store; a draft whose file was
replaced by compaction copies its stored extents on commit. Unreachable
arena nodes are reclaimed once they outweigh max(reachable, 32 KiB).
Typing into the middle of a 1 MiB document and saving each character peaked
at about 1,660 KiB RSS with a draft against about 4,480 KiB for an app copy
compared with storage on save; saves were only 1-2 ms faster. This corrects
073, which had attributed the TUI's remaining 8 ms to that comparison.
Drafts are not yet charged to the runtime budget or visible to .pure
definitions.
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store-tree.c keeps every document in one append-only file as a persistent
B-tree of byte extents, with the key catalog in the same structure. A splice
writes only the changed leaf and path; unchanged extents are shared between
versions, readers take no lock, and two alternating head slots publish a
commit after its nodes are durable. Compaction rewrites reachable nodes.
On the recorded ext4 host a durable 1-byte middle insert into a 1 MiB
document took 8.58 ms against 78.51 ms for the default store, and the real
TUI's Ctrl+S after typing took 16.60 ms against 84.59 ms. check-tree runs the
store's crash/oracle tests and the unchanged runtime, splice, async and
real-PTY editor checks on it. It stays opt-in: linked code is 12.7 KB larger
and contiguous multi-leaf reads copy.
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