Read value from lynx_value of map type by given key.
| Key | Description |
|---|---|
| [in] env | The environment in which lynx value runs, typically nullptr. |
| [in] object | The lynx_value to query. |
| [in] utf8name | The name of the property to get. |
| [out] result | The value of the property. |
Returns lynx_api_ok if the API succeeded. Returns lynx_api_map_expected if the types do not match.
After using the extracted result, memory needs to be freed using lynx_value_remove_reference.