hack to allow arrays of dtype=object to pass through check()
hack to allow arrays of dtype=object to pass through check()

McCabeJM/pymdptoolbox,yasserglez/pymdptoolbox,silgon/pymdptoolbox,sawcordwell/pymdptoolbox,yasserglez/pymdptoolbox,silgon/pymdptoolbox,McCabeJM/pymdptoolbox,sawcordwell/pymdptoolbox