type
  quicly_range_t* {.importc, header: "quicly/ranges.h", bycopy.} = object
    start*: uint64
    `end`*: uint64

  quicly_ranges_t* {.importc, header: "quicly/ranges.h", bycopy.} = object
    ranges*: ptr quicly_range_t
    num_ranges*: csize_t
    capacity*: csize_t
    initial*: quicly_range_t