toString, toBuffer only return low bytes for smaller (signed) ints

[proehlen]

Hi, I really like your library - thanks for sharing it. I'm having the issue described above.

const { Int64 } = require('int64_t');

const myInt = new Int64(-1);
console.log(myInt.toString(16)); // ffffffff
console.log(myInt.toBuffer()); // <Buffer 00 00 00 00 ff ff ff ff>

To make a 64 bit (signed) int out of those return values I would have to test the highest bit in the lowest word and, if set, fill the high word with FF bytes which is the kind of extra processing I was hoping to avoid by using your library.

This is the result I would expect:

const { Int64 } = require('int64_t');

const myInt = new Int64(-1);
console.log(myInt.toString(16)); // ffffffffffffffff
console.log(myInt.toBuffer()); // <Buffer ff ff ff ff ff ff ff ff>

[gucchisk]

I'm sorry for replaying so late.
And thank you for using and create this issue.

This bug is fixed by #21.

But sorry, myInt.toString(16) is -1.
This is the specifications of this library.
If you want to get ffffffffffffffff, please write as stated below.

const { Int64 } = require('int64_t');
const myInt = new Int64(-1);
console.log(myInt.toUnsigned().toString(16));  // ffffffffffffffff
console.log(myInt.toBuffer());  // <Buffer ff ff ff ff ff ff ff ff>

Best regard.

[gucchisk]

Fixed.