Set lynx_value property into map at the key specified.
| Key | Description |
|---|---|
| [in] env | The environment in which lynx value runs, typically nullptr. |
| [in] object | The lynx_value representing map. |
| [in] utf8name | The name of the property to set. |
| [in] value | The property value. |
Returns lynx_api_ok if the API succeeded. Returns lynx_api_map_expected if the types do not match.