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```
releaseHeader('2010-01-10', '0.2.2', '0.2.1')
```
When performing a comprehension over an object, use `ino`, instead of `in`, which helps us generate smaller, more efficient code at compile time.
Added `::` as a shorthand for saying `.prototype.`
The “splat” symbol has been changed from a prefix asterisk `*`, to a postfix ellipsis `...`
Added JavaScript’s `in` operator, empty `return` statements, and empty `while` loops.
Constructor functions that start with capital letters now include a safety check to make sure that the new instance of the object is returned.
The `extends` keyword now functions identically to `goog.inherits` in Google’s Closure Library.
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