Int32.Map
Build a datatype of the map according to the datatype of values in the map.
val pretty :
?pre:Pretty_utils.sformat ->
?sep:Pretty_utils.sformat ->
?arrow:Pretty_utils.sformat ->
?suf:Pretty_utils.sformat ->
?empty:Pretty_utils.sformat ->
'a Pretty_utils.formatter ->
'a t Pretty_utils.formatter