[perl #132111] Make it possible to change the buffer size on a handle (.set-buffer?)

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# New Ticket Created by  Aleks-Daniel Jakimenko-Aleksejev 
# Please include the string:  [perl #132111]
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Using nqp, one can do something like:

nqp::setbuffersizefh(nqp::getstdout(), 0);

But it would be nice if it was available from Perl 6 level.


See also: https://github.com/rakudo/rakudo/pull/1160