uint32 NONE=0
uint32 APPENDING=1
uint32 MILESTONE=2
uint32 NO_SMOOTH=4
uint32 KEY_POINTS=8
uint32 PRECISE=16
uint32 WITH_YAW=32
uint32 RETURN_UNREACHABLE_DIRECTLY=64
uint32 KEY_POINTS_WITH_OA=128
uint32 flags
