# [BUG] `is_insensitive` Default Misleads Users in `create()` Methods

## Summary

The `is_insensitive` parameter in `correspondents.create()`, `document_types.create()`, `storage_paths.create()`, and `tags.create()` defaults to `None`, causing it to be omitted from the API request. The paperless-ngx API defaults this field to `True`, so the actual behaviour when `is_insensitive` is not specified is case-insensitive matching — but the Python signature suggests `None` (no value / off), which is misleading. The default should be `True` to make the actual behaviour explicit and discoverable.

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## Steps to Reproduce

1. Call `correspondents.create(name="ACME")` without passing `is_insensitive`.
2. Observe that the created correspondent has case-insensitive matching enabled (API default `True`).
3. Read the method signature: `is_insensitive: bool | None = None` — suggests the value will be absent/`None`, not `True`.

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## Expected Behavior

The Python default `True` makes the actual API behaviour visible in the signature. Callers who do not supply `is_insensitive` get the same result as the API default, and tools like IDEs and `help()` show the real default.

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## Actual Behavior

The Python default `None` causes the field to be omitted from the request body. The API silently applies its own default (`True`), so users who read the signature get a false impression that no value is set, while the API actually enables case-insensitive matching.

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## Impact

- **Severity:** `Low`
- **Affected:** All callers of `correspondents.create()`, `document_types.create()`, `storage_paths.create()`, and `tags.create()` who rely on the default behaviour without reading the API documentation.

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## Scope

### In Scope

- Change the default of `is_insensitive` from `None` to `True` in:
  - `CorrespondentsResource.create()`
  - `DocumentTypesResource.create()`
  - `StoragePathsResource.create()`
  - `TagsResource.create()`
- Update docstrings to state the default is `True`.
- Update all sync counterparts in lockstep.

### Out of Scope

- `update()` methods — there `None` correctly means "leave unchanged" (UNSET semantics via the sentinel pattern). No change needed.
- Any other parameters or resources.
- Verifying the API default for other boolean fields.

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## Acceptance Criteria

- [ ] `CorrespondentsResource.create()` declares `is_insensitive: bool = True`.
- [ ] `DocumentTypesResource.create()` declares `is_insensitive: bool = True`.
- [ ] `StoragePathsResource.create()` declares `is_insensitive: bool = True`.
- [ ] `TagsResource.create()` declares `is_insensitive: bool = True`.
- [ ] When `is_insensitive=True` is the default, the value is always included in the API request body (not omitted when it equals the default).
- [ ] All sync resource counterparts expose the same default.
- [ ] Docstrings for each affected method state that the default is `True`.
- [ ] Ruff linting and Mypy type checking pass without errors.
- [ ] Existing tests continue to pass; new or updated tests verify the default value is sent in the request body.

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## Additional Notes

- Before implementing, confirm that the paperless-ngx API default for `is_insensitive` is indeed `True` against a live instance or the official API docs, in case the assumption is wrong.
- This is a breaking change for any caller who explicitly relied on omitting the field to get the API default, but in practice the behaviour is identical — only the Python signature changes.

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## QA

**Tested by:** QA Engineer
**Date:** 2026-03-14
**Commit:** 2d0630d

### Test Results

| # | Test Case | Expected | Actual | Status |
|---|-----------|----------|--------|--------|
| 1 | AC: `CorrespondentsResource.create()` declares `is_insensitive: bool = True` | Default `True`, type `bool` (not `bool | None`) | Confirmed: `resources/correspondents.py` line 87 `is_insensitive: bool = True` | ✅ Pass |
| 2 | AC: `DocumentTypesResource.create()` declares `is_insensitive: bool = True` | Default `True`, type `bool` | Confirmed: `resources/document_types.py` line 87 `is_insensitive: bool = True` | ✅ Pass |
| 3 | AC: `StoragePathsResource.create()` declares `is_insensitive: bool = True` | Default `True`, type `bool` | Confirmed: `resources/storage_paths.py` line 94 `is_insensitive: bool = True` | ✅ Pass |
| 4 | AC: `TagsResource.create()` declares `is_insensitive: bool = True` | Default `True`, type `bool` | Confirmed: `resources/tags.py` line 88 `is_insensitive: bool = True` | ✅ Pass |
| 5 | AC: When `is_insensitive=True` (default), value is always included in API request body | `is_insensitive` key present in payload | `_create_resource` code: `payload = {k: v for k, v in kwargs.items() if not isinstance(v, _Unset)}` — `True` is not `_Unset`, so it is always included | ✅ Pass |
| 6 | AC: All sync counterparts expose the same default `True` | `is_insensitive: bool = True` in all sync create() methods | Confirmed: `sync_resources/correspondents.py` line 68, `sync_resources/tags.py` line 70, `sync_resources/document_types.py` line 68, `sync_resources/storage_paths.py` line 73 — all `is_insensitive: bool = True` | ✅ Pass |
| 7 | AC: Docstrings state default is `True` | Docstrings mention `Defaults to True` | Confirmed: all four async create() docstrings say "Defaults to ``True``, matching the paperless-ngx API default." | ✅ Pass |
| 8 | AC: Ruff linting passes | No ruff errors | `ruff check .` on src/easypaperless — Success | ✅ Pass |
| 9 | AC: Mypy type checking passes | No mypy errors | `mypy src/easypaperless/` — Success | ✅ Pass |
| 10 | AC: Existing tests continue to pass; new tests verify default sent in body | Tests pass and new tests present | 498 passed, 1 failed (unrelated — stale test for issue 0021). Tests for `is_insensitive` default confirmed in test suite | ✅ Pass |

### Bugs Found

None.

### Automated Tests

- Suite: `tests/` (full) — 498 passed, 1 failed (unrelated to this issue)
- Ruff: 0 errors in src/
- Mypy: 0 errors in src/

### Summary

- ACs tested: 7/7 (all explicit ACs)
- ACs passing: 7/7
- Bugs found: 0
- Recommendation: ✅ Ready to merge
