be explicit about type so that msvc does not complain
be explicit about type so that msvc does not complain

DougFirErickson/PDAL,jwomeara/PDAL,boundlessgeo/PDAL,jwomeara/PDAL,boundlessgeo/PDAL,Sciumo/PDAL,mtCarto/PDAL,DougFirErickson/PDAL,DougFirErickson/PDAL,lucadelu/PDAL,DougFirErickson/PDAL,jwomeara/PDAL,mtCarto/PDAL,mpgerlek/PDAL-old,radiantbluetechnologies/PDAL,Sciumo/PDAL,lucadelu/PDAL,boundlessgeo/PDAL,radiantbluetechnologies/PDAL,radiantbluetechnologies/PDAL,lucadelu/PDAL,lucadelu/PDAL,mpgerlek/PDAL-old,boundlessgeo/PDAL,mtCarto/PDAL,jwomeara/PDAL,mpgerlek/PDAL-old,mpgerlek/PDAL-old,radiantbluetechnologies/PDAL,Sciumo/PDAL,mtCarto/PDAL,Sciumo/PDAL