Feature Request: Allow to modify read-only attribute length for arrays

[Алексей Винокуров]

In actionscript it's quite practical to set array length attribute in order to quickly set up array size or clean it without iterated "pop" mess or creation of the new instance. I suppose it's quite low-level and not clean trick but it's very handy and looks clean in the code.

[Juraj Kirchheim]

To clean use `array.splice(desiredLength, array.length -
desiredLength)`. To grow an array (although I'm not sure why you'd
need that), you can do `array[desiredLength-1] = null` (note that on
some platforms this may create sparse arrays which may not have the
performance characteristics that you're after).

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[Hugh]

Yeah, this would be nice.

We could at least have an ArrayTools:

using ArrayTools;

myArray.setLength(100);

bu this is not as good.

Hugh

[Алексей Винокуров]

Setting up size is usable for hash or cycle array that fills in random order and can grow sometimes. Splice loooks like good idea but it creates another instance of array and copies all deleted items to it -- it's rather expensive function.