JSON is 27 chars:
{"compact":true,"binary":0}

AsciiPack is 19 chars:
r2NcompactYMbinary0
    r2 => map of length 2.
    Ncompact => string of length 7 and value is "compact".
    Y => true.
    Mbinary => string of length 6 abd value is "binary".
    0 => fixint value is 0.

All object serialize format.
key | [length] | [variable]

`F` is Hexadecimal number by one char.
`D` is Decimal number.

int 4:
a | F

int 8:
b | FF

int 16:
c | FFFF

int 32:
d | FFFFFFFF

int 64:
e | FFFFFFFFFFFFFFFF

positive fixint:
0-9A-F

uint 8:
g | FF

uint 16:
h | FFFF

uint 32:
i | FFFFFFFF

uint 64:
j | FFFFFFFFFFFFFFFF

float 32:
k | FFFFFFFF

float 64:
l | FFFFFFFFFFFFFFFF

fixstr:
G-V | data

str 8:
n | FF | data

str 16:
o | FFFF | data

str 32:
p | FFFFFFFF | data

map 4:
r | F | N * (key + value)

map 8:
s | FF | N * (key + value)

map 16:
t | FFFF | N * (key + value)

map 32:
u | FFFFFFFF | N * (key + value)

* N is the size of map

array 4:
v | F | N * value

array 8:
w | FF | N * value

array 16:
x | FFFF | N * value

array 32:
y | FFFFFFFF | N * value

* N is the size of array

nil:
W

false:
X

true:
Y