Have Klarna::setAddress accept one call to set both Billing and Shipping Address

[LeonidasJP]

Currently, Klarna::setAddress will only accept an address, if either the flag Flags::IS_SHIPPING or Flags::IS_BILLING has been set (eg: $k->setAddress(Flags::IS_SHIPPING, $addr);)
If both of these flags are set in the same call, it will refuse to accept an address passed to the function. (eg: $k->setAddress(Flags::IS_SHIPPING & Flags::IS_BILLING, $addr);)

Is it possible to extend the functionality of Klarna::setAddress to allow both flags to be set, and set both the Billing and Shipping addresses at the same time?