[Jprogramming] bug in j806 (I think) ambivalent explicit conjunction

['Pascal Jasmin' via Programming]

a =: 2 : ('u@v';':';'u v')
   a2 : 0u@v:u v)
so far so good...
  - a +- +
it just assumes that result expression is dyadic
workaround is to use tacit version of : in return value of a, but this doesn't 
seem like it is working right.
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