Feature #7068: ability to deactivate Hash#compare_by_identity()

• Status: Rejected
• Assignee: matz (Yukihiro Matsumoto)
• Target version: 2.6

[sunaku (Suraj Kurapati)]

Hello,

I am using ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-linux].

There is no way to deactivate a Hash's compare by identity behavior:

h = Hash.new
h.compare_by_identity
h.compare_by_identity? #=> true
h.compare_by_identity
h.compare_by_identity? #=> still true

I want the ability to deactivate that behavior afterwards, like this:

h.compare_by_identity = false

Thanks for your consideration.

[drbrain (Eric Hodel)]

• Status changed from Open to Feedback

=begin

h = {}
h.compare_by_identity = true
h['a'] = 1
h['a'] = 2
h.compare_by_identity = false

What value is returned for (({h['a']}))?
=end

[mame (Yusuke Endoh)]

• Assignee set to matz (Yukihiro Matsumoto)
• Priority changed from Normal to 3
• Target version set to 2.6

Please make the proposal complete: your use case and the corner case behavior (Eric said).

--
Yusuke Endoh [e-mail]

[sunaku (Suraj Kurapati)]

Eric Hodel wrote:

=begin

h = {}
h.compare_by_identity = true
h['a'] = 1
h['a'] = 2
h.compare_by_identity = false

What value is returned for (({h['a']}))?
=end

Good point. This feature would violate the invariant of hash keys being unique. You may reject this feature request. Thanks.

[Eregon (Benoit Daloze)]

• Status changed from Feedback to Rejected