perl6/rakudo: How could I disable autoflush?

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

$*OUT.autoflush( 0 );

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$*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.

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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.