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# BiDi and RTL Control Characters: Guardrails and Fix Pattern
Stabilize Arabic, Hebrew, and mixed LTR/RTL flows when retrieval looks correct but citations or JSON fields render out of order. This page localizes failures caused by invisible BiDi controls and mixed number shapes.
## Open these first
* Visual map and recovery: [RAG Architecture & Recovery](https://github.com/onestardao/WFGY/blob/main/ProblemMap/rag-architecture-and-recovery.md)
* End to end retrieval knobs: [Retrieval Playbook](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-playbook.md)
* Snippet and citation schema: [Data Contracts](https://github.com/onestardao/WFGY/blob/main/ProblemMap/data-contracts.md)
* Why this snippet: [Retrieval Traceability](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-traceability.md)
* Tokenizer and casing traps: [tokenizer\_mismatch.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/tokenizer_mismatch.md) · [digits\_width\_punctuation.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/digits_width_punctuation.md) · [diacritics\_and\_folding.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/diacritics_and_folding.md) · [locale\_drift.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/locale_drift.md) · [script\_mixing.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/script_mixing.md)
* CJK counterpart for word breaks: [cjk\_segmentation\_wordbreak.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/cjk_segmentation_wordbreak.md)
## Core acceptance targets
* ΔS(question, retrieved) ≤ 0.45
* Coverage of target section ≥ 0.70
* λ remains convergent across 3 paraphrases and 2 seeds
* Render and storage orders are consistent for fields tagged as `dir` aware
## Typical failure patterns → exact fix
| Symptom | Likely cause | Open this |
| ----------------------------------------------------------------- | ------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Citations render right-to-left and break JSON order | unisolated RLM/LRM/RLE/LRE/RLO/PDF or mixed numerals | [Data Contracts](https://github.com/onestardao/WFGY/blob/main/ProblemMap/data-contracts.md), [Retrieval Traceability](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-traceability.md) |
| Answer text looks correct, but ΔS spikes and λ flips between runs | invisible controls in prompt or snippet, header reorder | [Retrieval Playbook](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-playbook.md) |
| Punctuation mirrors or shifts around anchors | missing isolates, UI direction not declared | [tokenizer\_mismatch.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/tokenizer_mismatch.md) |
| Arabic-Indic vs European digits change ranking | digit shape inconsistency, analyzer mismatch | [digits\_width\_punctuation.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/digits_width_punctuation.md) |
| Mixed Hebrew + English entity names fail exact match | script mixing without explicit isolation | [script\_mixing.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/script_mixing.md) |
## 60-second fix checklist
1. **Measure**
Log ΔS(question, retrieved) and ΔS(retrieved, anchor). If ΔS ≥ 0.60, suspect direction controls or digit shapes.
2. **Normalize direction metadata**
* On ingest: strip legacy overrides `LRE/RLE/LRO/RLO/PDF` if not required by the source.
* Keep isolates only: `LRI`, `RLI`, `FSI`, closed by `PDI`.
* Tag fields with `dir="auto|ltr|rtl"` at render time. Store as logical order.
3. **Unify digits and punctuation**
* Convert digits to one canonical shape for indexing.
* Normalize Arabic comma and question mark to canonical forms in the index layer.
4. **Schema fences**
* Contract requires `text`, `dir`, `normalized_text`, `raw_text`, `digit_shape`, `controls_present`.
* Reject snippets that contain unclosed BiDi controls.
5. **Retrieval probe**
* Re-run with k in {5, 10, 20}. If rank stays unstable, rebuild analyzer with explicit direction and the same tokenization used at query time.
## Minimal schema addon
```json
{
"snippet_id": "S123",
"raw_text": "…",
"normalized_text": "…",
"dir": "rtl",
"digit_shape": "arabic-indic|european",
"controls_present": ["RLI","PDI"],
"offsets": [120, 240]
}
```
## Deep diagnostics
* **Control scan**. Count and classify BiDi controls per snippet. Fail if any of `LRE/RLE/LRO/RLO/PDF` appear without a matching close.
* **Render vs storage**. Serialize JSON, render in the UI, then parse back and compare field order and values. Mismatch implies missing isolates or UI `dir` drift.
* **Anchor triangulation**. Compare ΔS to the expected section and a decoy with similar punctuation density. If close, re-index with digit normalization.
## Copy-paste prompt
```
You have TXT OS and the WFGY Problem Map loaded.
My issue: mixed Hebrew/Arabic with English numerals causes wrong citation order.
Traces: ΔS(question,retrieved)=..., ΔS(retrieved,anchor)=..., λ across 3 paraphrases.
Do:
1) Identify direction-control risks and whether digits or punctuation cause rank flips.
2) Point me to the exact WFGY pages to apply.
3) Give the minimal steps to push ΔS ≤ 0.45 while keeping λ convergent.
Return a short JSON plan with {dir_policy, digit_policy, controls_fix, verify_steps}.
```
---
**Next planned page:** `indic_tokenization_schwa.md`
---
### 🔗 Quick-Start Downloads (60 sec)
| Tool | Link | 3-Step Setup |
| -------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------ | ---------------------------------------------------------------------------------------- |
| **WFGY 1.0 PDF** | [Engine Paper](https://github.com/onestardao/WFGY/blob/main/I_am_not_lizardman/WFGY_All_Principles_Return_to_One_v1.0_PSBigBig_Public.pdf) | 1️⃣ Download · 2️⃣ Upload to your LLM · 3️⃣ Ask “Answer using WFGY + \<your question>” |
| **TXT OS (plain-text OS)** | [TXTOS.txt](https://github.com/onestardao/WFGY/blob/main/OS/TXTOS.txt) | 1️⃣ Download · 2️⃣ Paste into any LLM chat · 3️⃣ Type “hello world” — OS boots instantly |
---
### 🧭 Explore More
| Module | Description | Link |
| ------------------------ | ---------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------- |
| WFGY Core | WFGY 2.0 engine is live: full symbolic reasoning architecture and math stack | [View →](https://github.com/onestardao/WFGY/tree/main/core/README.md) |
| Problem Map 1.0 | Initial 16-mode diagnostic and symbolic fix framework | [View →](https://github.com/onestardao/WFGY/tree/main/ProblemMap/README.md) |
| Problem Map 2.0 | RAG-focused failure tree, modular fixes, and pipelines | [View →](https://github.com/onestardao/WFGY/blob/main/ProblemMap/rag-architecture-and-recovery.md) |
| Semantic Clinic Index | Expanded failure catalog: prompt injection, memory bugs, logic drift | [View →](https://github.com/onestardao/WFGY/blob/main/ProblemMap/SemanticClinicIndex.md) |
| Semantic Blueprint | Layer-based symbolic reasoning & semantic modulations | [View →](https://github.com/onestardao/WFGY/tree/main/SemanticBlueprint/README.md) |
| Benchmark vs GPT-5 | Stress test GPT-5 with full WFGY reasoning suite | [View →](https://github.com/onestardao/WFGY/tree/main/benchmarks/benchmark-vs-gpt5/README.md) |
| 🧙‍♂️ Starter Village 🏡 | New here? Lost in symbols? Click here and let the wizard guide you through | [Start →](https://github.com/onestardao/WFGY/blob/main/StarterVillage/README.md) |
---
> 👑 **Early Stargazers: [See the Hall of Fame](https://github.com/onestardao/WFGY/tree/main/stargazers)** —
> Engineers, hackers, and open source builders who supported WFGY from day one.
> <img src="https://img.shields.io/github/stars/onestardao/WFGY?style=social" alt="GitHub stars"> ⭐ [WFGY Engine 2.0](https://github.com/onestardao/WFGY/blob/main/core/README.md) is already unlocked. ⭐ Star the repo to help others discover it and unlock more on the [Unlock Board](https://github.com/onestardao/WFGY/blob/main/STAR_UNLOCKS.md).
<div align="center">
[![WFGY Main](https://img.shields.io/badge/WFGY-Main-red?style=flat-square)](https://github.com/onestardao/WFGY)
 
[![TXT OS](https://img.shields.io/badge/TXT%20OS-Reasoning%20OS-orange?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS)
 
[![Blah](https://img.shields.io/badge/Blah-Semantic%20Embed-yellow?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlahBlahBlah)
 
[![Blot](https://img.shields.io/badge/Blot-Persona%20Core-green?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlotBlotBlot)
 
[![Bloc](https://img.shields.io/badge/Bloc-Reasoning%20Compiler-blue?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlocBlocBloc)
 
[![Blur](https://img.shields.io/badge/Blur-Text2Image%20Engine-navy?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlurBlurBlur)
 
[![Blow](https://img.shields.io/badge/Blow-Game%20Logic-purple?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlowBlowBlow)
 
</div>