I recently upgraded to Rakudo 2018.01 and just now encountered some perplexing behavior.
Junctions, regardless of type, are being stringified one alternative per line. 1 & 2, 1 | 2, 1 ^ 2, and none(1, 2) are all displayed as a 1, a newline, and 2. Previously I would see eg. "all(1, 2)", which now I have to call .perl on the junction to see. Was this change intentional? It's hard to see it as an improvement, particularly considering how no information about the junction type is presented. I discovered the behavior by trying to print the return value of a function that returned a junction, something like this: sub f { all @_ } say "$_ => {f |$_}" for <1 2 3>, <4 5 6>; This prints: 1 2 3 => 1 1 2 3 => 2 1 2 3 => 3 4 5 6 => 4 4 5 6 => 5 4 5 6 => 6 It looks like the say is being hit six separate times, when it clearly should be called only twice...which it is, but it's impossible to tell from the output.