Does your application only rely on CORE modules? If not, you will have to assume that those non-CORE modules are installed with the users anyhow or they know how to install them. Little extra effort to install *some* YAML module too.
A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James
My blog: Imperial Deltronics