Why do javascript sort a numeric array not in numeric order?

I have faced with strange sorting result in Javascript for numeric arrays. For example result of sorting [1,2,10,20,100,200]: > [1, 2, 10, 20, 100, 200].sort() [ 1, 10, 100, 2, 20, 200 ] Why it's happening? It seems what the array sort cannot be used for sorting numeric arrays directly?
Yep. That's how it is defined in the specification: es5.github.io/#x15.4.4.11.

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