The types in the default formatter map:
formatter_map_entry("array", "array", 1)
formatter_map_entry("builtin", "character", 0)
formatter_map_entry("builtin", "float", 0)
formatter_map_entry("builtin", "int", 0)
formatter_map_entry("builtin", "int16", 0)
formatter_map_entry("builtin", "int32", 0)
formatter_map_entry("builtin", "int64", 0)
formatter_map_entry("builtin", "int8", 0)
formatter_map_entry("builtin", "string", 0)
formatter_map_entry("builtin", "uint", 0)
formatter_map_entry("builtin", "uint16", 0)
formatter_map_entry("builtin", "uint64", 0)
formatter_map_entry("builtin", "uint8", 0)
formatter_map_entry("list", "list", 1)
formatter_map_entry("one_or_more", "one_or_more", 1)
formatter_map_entry("tree234", "tree234", 2)
formatter_map_entry("version_array", "version_array", 1)

ints:
42 -123

floats:
3.141 -10.0

chars:
['a', '*', '\n']

string:
"this is a string"

tuple:
{1, '2', 3.0, "four"}

array:
array([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 
21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 
40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, ...])

version_array:
version_array([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 
19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 
38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, ...])

list:
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 
22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, ...]

one_or_more:
one_or_more(1, [2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 
19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 
38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, ...])

map:
map([(1 -> 1), (2 -> 2), (3 -> 3), (4 -> 4), (5 -> 5), (6 -> 6), (7 -> 7), 
(8 -> 8), (9 -> 9), (10 -> 10), (11 -> 11), (12 -> 12), (13 -> 13), 
(14 -> 14), (15 -> 15), (16 -> 16), (17 -> 17), (18 -> 18), (19 -> 19), 
(20 -> 20), (21 -> 21), (22 -> 22), (23 -> 23), (24 -> 24), (25 -> 25), 
(26 -> 26), (27 -> 27), (28 -> 28), (29 -> 29), (30 -> 30), (31 -> 31), 
(32 -> 32), (33 -> 33), (34 -> 34), (35 -> 35), (36 -> 36), (37 -> 37), 
(38 -> 38), (39 -> 39), (40 -> 40), (41 -> 41), (42 -> 42), (43 -> 43), 
(44 -> 44), (45 -> 45), (46 -> 46), (47 -> 47), (48 -> 48), (49 -> 49), 
(... -> ...), ...])