From: usa@...
Date: 2017-03-25T15:39:44+00:00
Subject: [ruby-core:80326] [Ruby trunk Bug#12884] Using a HashWithIndifferentAccess with a default value in a function with a keyword parameter converts it to a Hash.

Issue #12884 has been updated by usa (Usaku NAKAMURA).

Backport changed from 2.1: DONTNEED, 2.2: REQUIRED, 2.3: REQUIRED, 2.4: DONE to 2.1: DONTNEED, 2.2: DONE, 2.3: REQUIRED, 2.4: DONE

ruby_2_2 r58092 merged revision(s) 57360.

----------------------------------------
Bug #12884: Using a HashWithIndifferentAccess with a default value in a function with a keyword parameter converts it to a Hash.
https://bugs.ruby-lang.org/issues/12884#change-63801

* Author: mderelle (Mathieu Derelle)
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.3.1
* Backport: 2.1: DONTNEED, 2.2: DONE, 2.3: REQUIRED, 2.4: DONE
----------------------------------------
A strange bug that broke our production when migrating from 2.1.9 to 2.2.5 (still present in 2.3.1)
It involves HashWithIndifferentAccess from active support. The version used is 3.2.22.4 (against all ruby versions)

Here's a bit of code to reproduce it :

~~~ ruby
def test(params = HashWithIndifferentAccess.new, disrupter: nil)
	params.class
end

x = HashWithIndifferentAccess.new
x[:foo] = 'bar'
test x
# 2.3.1 => Hash
# 2.2.5 => Hash
# 2.1.9 => HashWithIndifferentAccess
~~~

But this only happens if there is a keyword parameter AND a default value for your HashWithIndifferentAccess parameter :

Not using a keyword parameter doesn't change the type

~~~ ruby
def test(params = HashWithIndifferentAccess.new, disrupter = nil)
	params.class
end

x = HashWithIndifferentAccess.new
x[:foo] = 'bar'
test x
# 2.3.1 => HashWithIndifferentAccess
# 2.2.5 => HashWithIndifferentAccess
# 2.1.9 => HashWithIndifferentAccess
~~~

Not using a default value don't change the type

~~~ ruby
def test(params, disrupter: nil)
	params.class
end

x = HashWithIndifferentAccess.new
x[:foo] = 'bar'
test x
# 2.3.1 => HashWithIndifferentAccess
# 2.2.5 => HashWithIndifferentAccess
# 2.1.9 => HashWithIndifferentAccess
~~~




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