std.data.json formal review

[via Digitalmars-d]

On Friday, 14 August 2015 at 11:44:35 UTC, Matthias Bentrup wrote:
> On Friday, 14 August 2015 at 09:20:14 UTC, Ola Fosheim Grøstad 
> wrote:
>> On Friday, 14 August 2015 at 08:03:34 UTC, Walter Bright wrote:
>>> 1. 'real' has enough precision to hold 64 bit integers.
>>
>> Except for the lowest negative value…
>>
>> (it has only 63 bits + floating point sign bit)
>
> actually the x87 format has 64 mantissa bits, although the bit 
> 63 is always '1' for normalized numbers.

Yes, Walter was right.

The most negative number can be represented since it is a -(2^63) 
, so you only need the exponent to represent it (you only need 1 
bit from the mantissa).