Issue #14891 has been reported by robotdana (Dana Sherson).

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

* Author: robotdana (Dana Sherson)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
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~~~ 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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