Some grid intersections not working with GeoDict

[mhearne-usgs]

 susdict = GeoDict({'xmin': -125.77257300046142,
 'xmax': -113.22738926075934,
 'ymin': 31.880531412840533,
 'ymax': 42.13252655167003,
 'dx': 9.3158457949e-05,
 'dy': 9.3158457949e-05,
 'ny': 110050,
 'nx': 134666})

shakedict = GeoDict({'xmin': -125.0,
 'xmax': -113.9,
 'ymin': 32.5,
 'ymax': 42.25,
 'dx': 0.01666666666666666,
 'dy': 0.016666666666666666,
 'ny': 586,
 'nx': 667})
int_dict = susdict.getIntersection(shakedict)
susdict.contains(int_dict)