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Issue title

`self.dtype` used but never assigned in __init__

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Pick exactly which findings appear in the issue body. By default the top 5 are included. Uncheck noise, check what matters.

Top 5 (default)
Severity Rule Title File:line
HIGH MINED108 `self.to_numpy` used but never assigned in __init__ tests/extension/decimal/array.py:343
HIGH MINED108 `self.isna` used but never assigned in __init__ tests/extension/decimal/array.py:304
HIGH MINED108 `self.isna` used but never assigned in __init__ tests/extension/decimal/array.py:303
HIGH MINED108 `self.isna` used but never assigned in __init__ tests/extension/decimal/array.py:274
HIGH MINED108 `self.dtype` used but never assigned in __init__ tests/extension/decimal/array.py:243
HIGH MINED108 `self.dtype` used but never assigned in __init__ tests/extension/decimal/array.py:229
HIGH MINED108 `self.dtype` used but never assigned in __init__ tests/extension/decimal/array.py:223
HIGH MINED108 `self._from_sequence` used but never assigned in __init__ tests/extension/decimal/array.py:226
HIGH MINED131 pre-commit hook `https://github.com/psf/black` pinned to mutable rev `26.3.1` .pre-commit-config.yaml:19
HIGH MINED131 pre-commit hook `https://github.com/PyCQA/isort` pinned to mutable rev `8.0.1` .pre-commit-config.yaml:15
HIGH MINED131 pre-commit hook `https://github.com/codespell-project/codespell` pinned to mutable rev `v… .pre-commit-config.yaml:10
HIGH MINED131 pre-commit hook `https://github.com/astral-sh/ruff-pre-commit` pinned to mutable rev `v0.… .pre-commit-config.yaml:5
MED SEC045 [SEC045] eval()/exec() on stored or user-supplied data: eval() and exec() on data — even … pandas-stubs/core/computation/eval.pyi:21
LOW AIC003 Duplicated implementation block across source files tests/dtypes.py:10
INFO MINED050 [MINED050] Stub Only Function: Function declared but body is just pass, return None, rais… pandas-stubs/errors/__init__.pyi:27
Reset to top 5 15 findings available (after auto-suppression of test files + won't-fix)

Issue body (markdown)

## Code-quality scan: `pandas-dev/pandas-stubs`

**Score: 90/100 (A-)**  ·  40 findings  ·  scanned 2026-06-05 18:25 UTC  ·  44,274 LOC

| Severity | Count |
|---|---|
| CRITICAL | 0 |
| HIGH | 12 |
| MEDIUM | 1 |
| LOW | 1 |

📊 [Full filterable report](https://repobility.com/scan/27af6abe-159e-456b-919a-51947cd83081/)  ·  ![scorecard](https://repobility.com/scan/27af6abe-159e-456b-919a-51947cd83081/report.png?v=1780683920-s2)

### Top findings

1. **HIGH** `MINED108` — `self.to_numpy` used but never assigned in __init__
   `tests/extension/decimal/array.py:343` · ✓ Repobility
2. **HIGH** `MINED108` — `self.isna` used but never assigned in __init__
   `tests/extension/decimal/array.py:304` · ✓ Repobility
3. **HIGH** `MINED108` — `self.isna` used but never assigned in __init__
   `tests/extension/decimal/array.py:303` · ✓ Repobility
4. **HIGH** `MINED108` — `self.isna` used but never assigned in __init__
   `tests/extension/decimal/array.py:274` · ✓ Repobility
5. **HIGH** `MINED108` — `self.dtype` used but never assigned in __init__
   `tests/extension/decimal/array.py:243` · ✓ Repobility

---

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34/41 findings (83%) on this scan are already flagged as test-file, won't-fix, or suppressed. The scan is too noisy to file as a single issue. Curate down to specific actionable findings, or address the FP source first.
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