Issue #14863 has been updated by nobu (Nobuyoshi Nakada).

Status changed from Feedback to Rejected

duerst (Martin Drst) wrote:
> On the other hand, if we change it to the source encoding, then the implementation gets more difficult (it has to somehow get the source encoding). Also, some programs that use this functionality in a setup where the encoding of the data and the source encoding isn't the same, and where occasionally an array is empty, may stop to work.

There is no way to get the source encoding in a caller (unless its binding is available) from library methods, so the source encoding can't be a choice. ;)

----------------------------------------
Bug #14863: Array#join with empty array returns empty string always in US-ASCII encoding
https://bugs.ruby-lang.org/issues/14863#change-72830

* Author: xsimov (Xavier Sim)
* Status: Rejected
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.4.2
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
----------------------------------------
Calling
~~~
irb(main):001:0> [].join.encoding
=> #<Encoding:US-ASCII>
~~~ 
returns an empty string and that empty string is always in US-ASCII encoding.

The expected result is that the returned empty string would be in UTF-8 since it seems to be the default for Ruby strings since 2.0.





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