Math.round() doesn't follow specification for exact 0.5

Just to add:

$ ./espruino
>(new Float64Array([101.5])).buffer
=new Uint8Array([0, 0, 0, 0, 0, 96, 89, 64]).buffer

$ node
> (new Float64Array([101.5])).buffer
ArrayBuffer { byteLength: 8 }
> new Uint8Array((new Float64Array([101.5])).buffer)
Uint8Array [ 0, 0, 0, 0, 0, 96, 89, 64 ]

So this would appear not to be a parsing issue (like 1573) but is to do with the rounding code itself