  int16_t   aI16      attr   = 512
  int32_t   aI32      attr   = 131072
  int8_t    aI8       attr   = 0
  float     aR32      attr   = 0
  double    aR64      attr   = 0
  uint16_t  aU16      attr   = 32768
  uint32_t  aU32      attr   = 2147483648
  uint8_t   aU8       attr   = 128
  string    name      attr   = "TestUtilsCWrite"
  int32_t   nwriters  attr   = 1
  uint16_t  shape2D   attr   = {4, 5}
  string    strarray  attr   = {"first", "second", "third", "fourth"}
