[ruby-core:87763] [Ruby trunk Bug#14891] Pathname#join has different behaviour to File.join

Issue #14891 has been updated by Hanmac (Hans Mackowiak).



More examples:

~~~ ruby
Pathname.new('/a').join('c', 'b').to_s #=> "/a/c/b"
Pathname.new('/a').join('/c', 'b').to_s #=> "/c/b"
Pathname.new('/a').join('/c', '/b').to_s #=> "/b"
~~~

Why it does this?
because `"/c"` means start of an absolute path there

----------------------------------------
Bug #14891: Pathname#join has different behaviour to File.join
https://bugs.ruby-lang.org/issues/14891#change-72787

* 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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