The `csv` module handles comma-separated values following RFC 4180: quoted fields, embedded commas, newlines in quoted fields, and escaped quotes (doubled).

```vary
from csv import parse_records, write_records

let text = "name,age\nAlice,30\nBob,25"
let records = parse_records(text)
print(records[0]["name"])    # Alice

let output = write_records(records, ["name", "age"])
```

## Functions

| **Function** | **Returns** | **Description** |
|----------|-----------|-------------|
| `parse_rows(text)` | `List[List[Str]]` | Parse CSV text into a list of rows |
| `parse_records(text)` | `List[Dict[Str, Str]]` | Parse CSV with headers, first row becomes keys |
| `write_rows(rows)` | `Str` | Serialize rows to CSV text; auto-quotes |
| `write_records(records, headers)` | `Str` | Serialize records to CSV with given headers |