Function err

err<T>(issues: readonly DecodingIssue[]): Result<T>
Creates a new Err instance representing a failed operation.
Type Parameters
- T
  The type that would have been returned if successful
Parameters
- issues: readonly DecodingIssue[]
  One or more structured issues describing what went wrong and where.
Returns Result<T>
Example
```
const result = JsonDecoder.err<number>([{ message: "Invalid number", path: ["age"] }]);
// result.issues === [{ message: "Invalid number", path: ["age"] }]
```