FWIW, this was fixed with the work on IO::CatHandle/CatPath (630a9b20f9e829bf1535 and later). Unfortunately, we had to revert this until 6.d will come around.
> On 11 Aug 2016, at 01:42, Wenzel Peppmeyer (via RT) > <perl6-bugs-follo...@perl.org> wrote: > > # New Ticket Created by Wenzel Peppmeyer > # Please include the string: [perl #128895] > # in the subject line of all future correspondence about this issue. > # <URL: https://rt.perl.org/Ticket/Display.html?id=128895 > > > > perl6 -e 'say $*ARGFILES.words' > # OUTPUT: > # read string requires an object with REPR MVMOSHandle > # in block <unit> at -e line 1 > > # expected the same as $*ARGFILES.lines (falls back to $*IN)