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Filehandle method calls load IO::File on demand
When a method call on a filehandle would die because the method can not
be resolved and L<IO::File> has not been loaded, Perl now loads IO::File
via C<require> and attempts method resolution again:
open my $fh, ">", $file;
$fh->binmode(":raw"); # loads IO::File and succeeds
This also works for globs like STDOUT, STDERR and STDIN:
STDOUT->autoflush(1);
Because this on-demand load only happens if method resolution fails, the
legacy approach of manually loading an IO::File parent class for partial
method support still works as expected:
use IO::Handle;
open my $fh, ">", $file;
$fh->autoflush(1); # IO::File not loaded