When does Perl close a filehandle?

[szabgab]

I just bumped into this problem in thread: http://www.mail-archive.com/perl6-users@perl.org/msg03594.html but it is not over yet for my application. I still get the same error even after replacing the slurp-rest calls by plain slurp calls. There are other calls to open so I looked at https://docs.perl6.org/routine/open but as I can see nothing related to close is mentioned there. I think it would be better to mention when Perl closes the file automatically and when does it not.

I also went over https://docs.perl6.org/type/IO$COLON$COLONHandle where close is described, but I think an explicit mention on how files are closed implicitly would be welcome.