perl6/rakudo: How could I disable autoflush?

I tried this, but it didn't开发者_Go百科 work:

$*OUT.autoflush( 0 );

$*OUT.autoflush = False should disable it, and it runs without error, but it seems that parrot's IO still flushes automatically. So there currently doesn't seem to be an easy way.

Rakudo doesn't support autoflush. There's a note in 5to6-perlvar under the $OUTPUT_AUTOFLUSH entry.

Some examples from a long time ago mention an autoflush method, but that has disappeared:

$*ERR.autoflush = True;
$*ERR.say: "1. This is an error";
$*OUT.say: "2. This is standard out";

But that doesn't work:

No such method 'autoflush' for invocant of type 'IO::Handle'

I haven't seen any discussions about when this might show up as a feature, or a proclamation that it will never be a feature.