Issue #13146 has been updated by Nobuyoshi Nakada.


Linus Sellberg wrote:
> 1: NaN is given a random hash (to avoid hash key collisions). 
> 2: Hash insertion work, but never overwrite - always adds a new key.
> 3: Lookup never finds anything
> 4: Iteration over the values works.

It doesn't work right now as you expect, since the hash assumes same elements are always equal, regardless their hash values.

----------------------------------------
Bug #13146: Float::NANs in Hashes are confusing (more than usual). 
https://bugs.ruby-lang.org/issues/13146#change-62731

* Author: Linus Sellberg
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.3.1p112
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
----------------------------------------
```ruby
test = {Float::NAN => 1, -Float::NAN => 2}
=> {NaN=>1, NaN=>2}

test.values_at(Float::NAN, -Float::NAN)
=> [1, nil]
```

I don't know what the correct behaviour ought to be, but it seems inconsistent to create a hash with two elements but not be able to extract both values.



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