Dart2js translates << by 0 incorrectly.

[fsc8000]

The attached dart program fails: It seems -1 << 0 results in 4294967295 instead of -1.

foo(a) => a << 0;

main() {
  Expect.equals(-1, foo(-1));
}

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Attachment:
shl-by-0.dart (60 Bytes)

[DartBot]

This comment was originally written by [email protected]

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Added Duplicate label.
Marked as being merged into #1533.

[fsc8000]

Wouldn't it be possible to make ints that are not in the big-int range behave as expected? -1 is clearly within the precise range of JavaScript numbers.

[rakudrama]

You can make things work in only 1 of the two ranges:
[-2^31, 2^31) aka signed
[0, 2^32) aka unsigned

dart2js chooses the second.

Either one is a reasonable choice, but 'unsigned' makes the encryption libraries run.