slice_spec: remove instance variables
slice_spec: remove instance variables

thisMagpie/nmatrix,wlevine/nmatrix,johnmarinelli/nmatrix,johnmarinelli/nmatrix,johnmarinelli/nmatrix,wlevine/nmatrix,janusnic/nmatrix,janusnic/nmatrix,thisMagpie/nmatrix,wlevine/nmatrix,agisga/nmatrix,agisga/nmatrix,thisMagpie/nmatrix,agisga/nmatrix,janusnic/nmatrix,johnmarinelli/nmatrix,agisga/nmatrix,wlevine/nmatrix,thisMagpie/nmatrix,janusnic/nmatrix