整数溢出
uint8 -> 0-255
uint16 -> 0-65535
uint32 -> 0-4294967295
uint36 -> 0-18446744073709551615
int8 -> -127-128
int16 -> -32768-32767
int32 -> -2147483648-2147483647
int64 -> -9223372036854775808-9223372036854775807 
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