sync AS and portable behaviour for Array#sort with default comparator

[MaxGraey]

This normalize Array#sort() for portable so now:

[0, -0, -1, NaN, Infinity, 2, 123].sort()

output (which the same as AS):

[ -1, -0, 0, 2, 123, Infinity, NaN ]

instead:

[ -1, 0, -0, 123, 2, Infinity, NaN ]

This also speed-up array's sort

[dcodeIO]

Does this work for arrays of strings?

[MaxGraey]

Does this work for arrays of strings?

yes

And for arrays with mixed strings and null / undefined

[MaxGraey]

Also with latest version I got pretty cheap overhead:

[MaxGraey]

ok it seems I'm happy with this solution.
@dcodeIO try test this with different types. And if it will be ok it could be merged I guess