Issue #14891 has been updated by znz (Kazuhiro NISHIYAMA).


I think it is expected behavior.

https://github.com/ruby/ruby/blob/38e05ff3e194268fd2f38ac7c9530298e464f07b/test/pathname/test_pathname.rb#L211

```ruby
  defassert(:plus, '/b', 'a', '/b')
```

----------------------------------------
Bug #14891: Pathname#join has different behaviour to File.join
https://bugs.ruby-lang.org/issues/14891#change-72903

* Author: robotdana (Dana Sherson)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.6.0-preview2, and before
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
----------------------------------------
~~~ ruby
Pathname.new('/a').join('/b').to_s
# => "/b"
File.join(Pathname.new('/a'), '/b').to_s
# => "/a/b"
~~~

in my case `'/b'` was in a variable and it wasn't immediately obvious why it wasn't working when I moved to use Pathname

This seems to not be desired behaviour as it's different to `File.join`, and this case isn't document anywhere.

Can we either change the behaviour to treat the "other" of `Pathname#+` as always relative (possibly just removing a leading slash), or add this case to the documentation?



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