Int type sizes vary on some platforms; fix a bug caused by that
Int type sizes vary on some platforms; fix a bug caused by that

c-north/hdbscan,brunoalano/hdbscan,scikit-learn-contrib/hdbscan,lmcinnes/hdbscan,lmcinnes/hdbscan,scikit-learn-contrib/hdbscan,brunoalano/hdbscan