Use int to represent a boolean

Date-like-string which can be converted to Date object by new Date(foo)

Single-precision 32-bit IEEE 754 floating point

Float-like-string

32-bit signed two's complement integer, which has a minimum value of -2^{31 and a maximum value of 2}31-1

Int-like-string

JSON-string which can be converted to json object by JSON.parse(foo)