So one thing I wasnt sure of is: If you have a Starlark program how is the value of it decided? Is it simply the value of the last expression? And where does th

So one thing I wasnt sure of is: If you have a Starlark program how is the value of it decided? Is it simply the value of the last expression? And where does the print-output end up? Is it just for diagnostics and has no influence on the value?