omit internal attributes in residual goals when using taut/2
omit internal attributes in residual goals when using taut/2

Examples:

    ?- taut(X=:=X,1).
       clpb:sat(X=:=X)
    ;  false.

    ?- taut(X=\=X,0).
       clpb:sat(X=:=X)
    ;  false.

mthom/rusty-wam