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IDL
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sequence
- As return value always returns a new JavaScript Array.
- Better than [] for methods and dictionaries taking arrays.
[]
- When a method returns a [] it either returns a new copy or the same.
- The returned object is not a JavaScript Array.
- If the returned object is declared readonly it can still be manipulated by the browser, unlike a frozen JavaScript Array.
- In general this is probably better avoided. There's a desire expressed to kill [].