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stdbuf does not work

Dear list,
I require line buffered output from program1 and line buffered input to program2.The following works under Linux but not under Cygwin.   stdbuf -oL -eL program 1 |& program2

I've searched the archive without success.I have tried -o0 -e0 -i0 and have also tried
  stdbuf -oL -eL program1 |& stdbuf -i0 program2
I have a fresh installation of cygwin as of a few months ago:  uname -a              yields:CYGWIN_NT-10.0 DESKTOP-S92525R 2.10.0(0.325/5/3) 2018-02-02 15:16 x86_64 Cygwin
  stdbuf --version    yields:stdbuf (GNU coreutils) 8.26Packaged by Cygwin (8.26-2)Copyright (C) 2016 Free Software Foundation, Inc....
Thanks for your help.
Best - Don

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