Function parse_merged 

pub fn parse_merged<T: DeserializeOwned + Default>(
    config: &GoogleConfig,
    provider_options: &ProviderOptions,
    merge: impl FnOnce(T, T) -> T,
) -> Result<T, InvalidArgumentError>

Parses T under the canonical google key and, when the configured name differs, under that name as well; merge combines the two (the custom key wins).

Errors

Returns InvalidArgumentError when either object does not match the option schema.