De-quoting (convrting the Windows’ command-line into argc/argv) does
not remove double quotes if characters not fit for 8-bit (?) are present.

	Broken in: CYGWIN_NT-6.1     Bu 3.3.4(0.341/5/3) 2022-01-31 19:35 x86_64 Cygwin
	Works  in: CYGWIN_NT-6.1-WOW Bu 2.2.1(0.289/5/3) 2015-08-20 11:40 i686   Cygwin

To reproduce, do in CMD’s command line:

  D:\> D:\Programs\cygwin2022\bin\perl -wle "print for @ARGV" . "/i/" "/и/" .
  .
  /i/
  "/и/"
  .

Likewise for other characters which do not fit into 8-bits.  (I have a
TrueType font enabled in a console.)

  (If you do not know how to type this, just copy-and paste it into a
   console with CMD.)

(The same happens on Win10.)

Hope this helps,
Ilya

P.S.  In the instructions for sending bugs
      	 https://www.cygwin.com/problems.html
      it says:

      	 If you can't run cygcheck for some reason (and why shouldn't
      	 you be able to? cygcheck is just a standard windows program
      	 which does not use the Cygwin dll)

      By the snide tone, I presume this is a rhetorical question…
      
             ( Hmm, anyway, after less than 1 hour, it actually
      	       terminated… So I attach the censored output. )

P.P.S.  It seems that the mailing list does not allow attaching the output!
	So I retry with a shortened version…