Rat.new. The code was very dumb, so it always tried set the denominator of the new Rat to the product of the denominators of the two numbers being added. Rakudo's Ints are really Int32 right now (more or less), so if that product was equal to or greater than
2**31, it was autoconverted to Num. But the
Rat.newwhich takes positional arguments takes Ints, so it wouldn't dispatch to that. Instead it would try to dispatch to the default autogenerated named argument form of
Rat.new. But that only takes the implicit
selfparameter, and we were sending it
self, Int, Num-- thus the "too many positional arguments: 3 passed, 1 expected" error!
Rakudo now autoconverts this case (
424/61731 + 832/61731) to Num to avoid the overflow in the denominator. Obviously this is less than ideal -- a denominator of 61731 would work fine for this sum -- but it does work. And how! Gone are the mysterious crashes and errors. With the number of samples cranked up, the curves look beautiful.
Now I just need to do a bit of polishing to the output and figure out how to post it to the blog. I'm definitely feeling I've accomplished something cool in Perl 6....
PS Aha! Preview graphic, I'll explain what it means next time.