FIX: Setter should validate new input, but current state.
FIX: Setter should validate new input, but current state.

scikit-xray/scikit-xray,tacaswell/scikit-xray,tacaswell/scikit-xray,tacaswell/scikit-beam,Nikea/scikit-xray,scikit-xray/scikit-xray,tacaswell/scikit-beam,scikit-xray/scikit-xray,tacaswell/scikit-beam,danielballan/scikit-xray,danielballan/scikit-xray,danielballan/scikit-xray,Nikea/scikit-xray,Nikea/scikit-xray,tacaswell/scikit-xray