fix(reactivity): enable trigger when use str to set length of arr

[bcq028]

js allows use string to set length of array. The original code uses an implicit conversion that requires newValue to be a number as key's type is string. If newValue is also a string, string comparison are performed instead of number comparison. The string comparison is lexicographical order, so "10"< "2", causing the length to be set to 2 but watch element at 10 will not be triggered

[antfu]

That's a strange behavior of JS, TIL. 😅

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