smallint - word16
integer  - word32
bigint   - word64
decimal - TODO
numeric - TODO
real - float32
double precision - float64

char - word8
text, varchar - text[n]

bytea - bytes[n]

bool - word8(1 for True, 0 for False)

word32 - dimension
word32 - 1 if array has NULL, 0 otherwise
oid - oid of element type
for each dimension:
  word32 - elements in dimension
  word32 - lower bound
for each element:
  word32 - elements length
  bytes[n] - encoded element