[perl #125182] bufs need .push

[via RT]

# New Ticket Created by  Ricardo SIGNES 
# Please include the string:  [perl #125182]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org/Ticket/Display.html?id=125182 >


A buf is supposed to be mutable, but I can't push to it.  TimToday++ said this
was incorrect behavior and just NYI.

  ~$ perl6 -e 'my $b = Buf.new(1,2,3); $b.push(4)'
  Cannot call push(Buf: Int); none of these signatures match:
      (Any:U \SELF: *@values, *%_)
    in block <unit> at -e:1

  ~$ perl6 -e 'my buf8 $b; $b.push(4)'
  Cannot modify an immutable Buf[uint8]

-- 
rjbs

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