lm_paypal_api_payment_form says currency_code not currency

In lm_paypal_api_payment_form:

 *     'currency_code': string
 *        Paypal 3 letters currency code, see lm_paypal_api_get_currency().
 *        Default is default configured currency in lm_paypal main module.

But actually line 398 is checking for "currency" to be in $options:

$currency = isset($options['currency']) ? $options['currency'] : lm_paypal_api_get_currency_default();