## Type-Specific Serialization

| Type       | Serialization Strategy                                                                                                     |
| ---------- | -------------------------------------------------------------------------------------------------------------------------- |
| Primitives | Direct value                                                                                                               |
| `Date`     | `toISOString()`                                                                                                            |
| Arrays     | For primitive-like element types, pass through; for `Date`/`Date                                                           |
| `Map<K,V>` | For primitive-like values, `Object.fromEntries(map.entries())`; for `Date`/`Date                                           |
| `Set<T>`   | Convert to array; element handling matches `Array<T>`                                                                      |
| Nullable   | Include `null` explicitly; for primitive-like and `Date` unions the generator avoids runtime `SerializeWithContext` checks |
| Objects    | Call `SerializeWithContext(ctx)` if available (to support user-defined implementations)                                    |

Note: the generator specializes some code paths based on the declared TypeScript
type to avoid runtime feature detection on primitives and literal unions.

## Field-Level Options

The `@serde` decorator supports:

- `skip` / `skipSerializing` - Exclude field from serialization
- `rename = "jsonKey"` - Use different JSON property name
- `flatten` - Merge nested object's fields into parent