dart2js treats (some) unsigned 32-bit integers as non ints

[DartBot]

This issue was originally filed by @bp74

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What steps will reproduce the problem?

1. run the following code

class Test {
  static final int Black = 0xFF000000;
}
testInt(var value) {
  print("value is an int: ${value is int}");
}
void main() {
  int x = Test.Black;
  testInt(x);
}

What is the expected output? What do you see instead?

The Dart-VM says: "value is an int: true"
compiled with frog: "value is an int: true"
compiled with dart2js: "value is an int: false"

Tested in Chrome 18, IE 9, Firefox 12.

What version of the product are you using? On what operating system?

Dart Editor Buid 7466 32 bit, Windows 7 64 bit

[rakudrama]

Added Area-Dart2JS, Triaged labels.

[DartBot]

This comment was originally written by @bp74

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Here is a simplified version of the test.
It's more obvious where the problem is:

testInt(var value) {
  print("value is an int: ${value is int}");
}

void main() {
  testInt(1);
  testInt(0xFFFFFFFF);
  testInt(0x1FFFFFFF);
}

-->
value is an int: true
value is an int: false
value is an int: true

Well, the value 0xFFFFFFFF (which could be -1 if you say it's 32 bit int) is not an int when compiled with dart2js.

[floitschG]

Dart2js currently only considers 31 bits as integers.
I will see if we can make improvements to get to the full range of 53 bits (maximum integer a double can represent without loss of precision).

[kasperl]

Set owner to @floitschG.
Added Accepted label.

[kasperl]

Added this to the M1 milestone.

[kasperl]

Changed the title to: "dart2js treats (some) unsigned 32-bit integers and non ints".

[floitschG]

Issue #3720 has been merged into this issue.

[floitschG]

Related (potentially duplicate): issue #3814

[kasperl]

Changed the title to: "dart2js treats (some) unsigned 32-bit integers as non ints".

[kasperl]

I don't think there's an extra information in here not covered by issue #3814. Marking as a duplicate.

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Added Duplicate label.
Marked as being merged into #3814.