Processing Sound - isPlaying() returns int instead of boolean

In the src files and in the github repo the isPlaying function of the processing sound library returns a boolean. It seems that there is no current compiled library in the contribution manager. (the change to boolean instead of integer as return type has been months ago in github). I need to get the current compiled library version or the src files of the version that is in the contribution manager because I need to extend the SoundFile class for further functionality.