| Fix the following issue: |
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| # Add a `validateAllPaths` validation option for documents |
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| Mongoose documents already let you narrow down what gets validated. For example, a schema |
| configured with `validateModifiedOnly: true` only runs validators on paths that were actually |
| modified, and callers can pass `pathsToValidate` / `pathsToSkip` to further restrict the work. |
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| We need the opposite escape hatch: a way to force validation of **every** path defined on the |
| schema, regardless of what has (or hasn't) been modified. |
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| Add a `validateAllPaths` boolean option that is accepted by both the asynchronous `validate()` |
| method and the synchronous `validateSync()` method (via their options object). When |
| `validateAllPaths` is `true`: |
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| - Validation runs against every path declared in the schema, including paths whose values were |
| never modified. This takes precedence over a schema-level `validateModifiedOnly` setting, so an |
| unmodified-but-invalid path is reported as an error even when the schema would normally skip it. |
| - Each element of an array path is validated too, so element-level validators (e.g. `enum` on the |
| items of a string array) run against every element. A failing element is reported under its |
| indexed path (for example `tags.0`). |
| - A document whose paths are all valid still passes: `validateSync()` returns `undefined` and |
| `validate()` resolves. |
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| The option is mutually exclusive with the existing path-narrowing options. Combining |
| `validateAllPaths` with any of the following must raise a `TypeError` (and `validate()` must reject |
| with it) before any validation runs, using these exact messages: |
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| - with `pathsToSkip` → `Cannot set both \`validateAllPaths\` and \`pathsToSkip\`` |
| - with `pathsToValidate` → `Cannot set both \`validateAllPaths\` and \`pathsToValidate\`` |
| - with a `validateModifiedOnly` option → `Cannot set both \`validateAllPaths\` and \`validateModifiedOnly\`` |
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| These rules apply identically to `validate()` and `validateSync()`. |
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