Some operations on HashSet<double> is ~5000 times slower than HashSet<int>

[DartBot]

This issue was originally filed by @mdakin

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What steps will reproduce the problem?
1.Run the code in server mode: https://gist.github.com/2575116

On my machine, output is:

ints
Add: 12 ms.
Contains: 3 ms.
Iterate: 5 ms.
Remove: 5 ms.
Sort list: 44 ms.

doubles
Add: 71282 ms.
Contains: 40625 ms.
Iterate: 5 ms.
Remove: 87247 ms.
Sort list: 65 ms.

What is the expected output? What do you see instead?
HashSet<double> and HashSet<int> should have a similar performance.

What version of the product are you using? On what operating system?
Mac, Linux. Dart SDK version 7149, Dartium version

Please provide any additional information below.
I checked the performance of hashCode() method on ints and doubles, they are similar (double is slightly slower, as expected).

[DartBot]

This comment was originally written by @mdakin

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Oh, I just realized hash value for doubles is always 0, so that causes the problem. Should I close the bug and reopen another, or this maybe this is a feature?

[DartBot]

This comment was originally written by @mdakin

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I created http://code.google.com/p/dart/issues/detail?id=2884 for better hashCode for doubles. This bug can be closed.

[anders-sandholm]

Added Duplicate label.
Marked as being merged into #2884.