[fspeech]

From the front page:

"It is easy to port libraries to Duck. Function hooks are implemented as pointers, of the form int (function_pointer)(int) where the argument count is passed as the only parameter. Arguments are bound as string identifiers, and are accessed dynamically in the bound-function's body."

I don't know the details but in my experience reducing the impedance mismatch to low level libraries is often a strong motivator to create one's own dsl instead of adopting a standard scripting language.