I can verify that 806 gives the same result as 805, and also that 804 gives the 
result you expect (at least on a Mac!)

    JVERSION
Engine: j806/j64avx/darwin
Beta-4: commercial/2017-06-27T12:55:06
Library: 8.06.03
Qt IDE: 1.5.3/5.6.2
Platform: Darwin 64
Installer: J806 install
InstallPath: /users/bobtherriault/j64-806
Contact: www.jsoftware.com
        ((,_1);,1) -: ((<"_1) ,._1 1)
1
        -&>/~ ((,_1);,1)
 0
_2

 2
 0
        -&>/~ ((<"_1) ,._1 1)
 0
_1

 2
 0

    JVERSION
Engine: j804/j64/darwin
Release: commercial/2015-12-21 18:06:25
Library: 8.04.15
Qt IDE: 1.4.10/5.4.2
Platform: Darwin 64
Installer: J804 install
InstallPath: /applications/j64-804
Contact: www.jsoftware.com
     ((,_1);,1) -: ((<"_1) ,._1 1)
1
     -&>/~ ((,_1);,1)
 0
_2

 2
 0
     -&>/~ ((<"_1) ,._1 1) 
 0
_2

 2
 0

Cheers, bob

> On Aug 17, 2017, at 11:09 AM, Jose Mario Quintana 
> <[email protected]> wrote:
> 
>   -&>/~ ((<"_1) ,._1 1) NB. Wrong!

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