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Double (IEEE754 Double precision 64-bit)
9223372036854775809

Most accurate representation = 9.223372036854775808E18
0x43E0000000000000 = 01000011 11100000 00000000 00000000
00000000 00000000 00000000 00000000
Sign Exponent Mantissa
0 10000111110 0000000000000000000000000000000000000000000000000000

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