From d7edee0821eeff39d8f28f064d5e7a85fca6ad94 Mon Sep 17 00:00:00 2001
From: polwex <polwex@sortug.com>
Date: Mon, 6 Oct 2025 02:19:52 +0700
Subject: yeahyeah

---
 ocaml/CLAUDE.md | 53 ++++++++++++++++++++---------------------------------
 1 file changed, 20 insertions(+), 33 deletions(-)

(limited to 'ocaml/CLAUDE.md')

diff --git a/ocaml/CLAUDE.md b/ocaml/CLAUDE.md
index 2577dee..491c73c 100644
--- a/ocaml/CLAUDE.md
+++ b/ocaml/CLAUDE.md
@@ -97,7 +97,7 @@ type reader = {
 
 ### 5. Jam/Cue Serialization (`lib/serial.ml`)
 
-**Status**: 🔴 IN PROGRESS - Has bugs
+**Status**: ✅ Complete and tested
 
 Implementation of noun serialization with backreference compression.
 
@@ -130,16 +130,24 @@ let mat_encode w n =
   end
 ```
 
-**Known Bugs**:
-1. ✅ Fixed: mat_encode for 0 wrote `true` instead of `false`
-2. ✅ Fixed: Was writing `a-1` in `b-1` bits, changed to `a` based on C code analysis
-3. 🔴 **CURRENT BUG**: Roundtrip test passes for 0,1,2,3 but fails at 4
-   - Test shows: `FAIL: 4 -> 0`
-   - Need to compare against actual Urbit jam output to find discrepancy
+**Key Fixes**:
+1. ✅ Mat encoding uses **leading 0 bits** followed by 1 bit (not the reverse!)
+2. ✅ Mat decoding formula: `a = 2^(b-1) + bits_read` (not just bits_read)
+3. ✅ Buffer initialization: Must use `Bytes.make` with zeros, not `Bytes.create`
 
 **Test Status** (`test/test_serial.ml`):
-- Atom roundtrip: FAILS at value 4
-- Basic jam/cue: Not yet fully validated
+- ✅ All atom roundtrip tests pass (0, 1, 2, 42, 255, 256, 65535, 1000000)
+- ✅ All cell roundtrip tests pass
+- ✅ All tree structure tests pass
+- ✅ Backref tests pass
+- ✅ Edge case tests pass (large atoms, deep nesting, wide trees)
+
+**Performance** (`test/bench_serial.ml`):
+- Small atom jam/cue: ~1 µs
+- Balanced tree: ~3 µs
+- Deep nesting (100 levels): ~76 µs
+- Comparable or faster than C for simple cases
+- See `BENCHMARKS_SERIAL.md` for detailed comparison
 
 ### 6. Python Urbit Interface (`urb.py`)
 
@@ -183,34 +191,13 @@ ocaml/
 
 ## Next Steps
 
-### Immediate Priority: Fix Jam/Cue Bug
-
-1. **Get test vectors from Urbit**:
-   ```bash
-   python3 urb.py -d "(jam 0)"
-   python3 urb.py -d "(jam 1)"
-   python3 urb.py -d "(jam 2)"
-   python3 urb.py -d "(jam 3)"
-   python3 urb.py -d "(jam 4)"  # This is where OCaml fails
-   ```
+### Completed: Jam/Cue Serialization ✅
 
-2. **Compare OCaml output**:
-   - Create test program to print hex output of jam for 0-10
-   - Compare against Urbit's output byte-by-byte
-   - Identify exact discrepancy in mat encoding
-
-3. **Fix mat_decode**:
-   - Ensure it matches the corrected mat_encode formula
-   - Currently may be reading `a-1` when it should read `a`
+All jam/cue functionality is now complete and tested!
 
 ### Future Work
 
-1. **Complete Jam/Cue**:
-   - Fix current bugs
-   - Add comprehensive tests
-   - Benchmark performance vs C
-
-2. **Memory Management**:
+1. **Memory Management**:
    - Implement noun hash-consing/deduplication
    - Add reference counting or GC integration
    - Study u3 memory system from C implementation
-- 
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