Issue #9073 has been reported by 046569 (?????? ???).

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Bug #9073: Array#join encoding problem
https://bugs.ruby-lang.org/issues/9073

Author: 046569 (?????? ???)
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 
ruby -v: ruby 2.1.0dev (2013-09-22 trunk 43011) [x86_64-darwin13.0.0]
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN


a=['hello']
a.push 'kitty'.force_encoding('ASCII-8BIT')
puts a.join
=> hellokitty

a=['????']
a.push '????'.force_encoding('ASCII-8BIT')
puts a.join
=> incompatible character encodings: UTF-8 and ASCII-8BIT (Encoding::CompatibilityError)
=> ????????(I expect)
some gems return ASCII-8BIT so I had to encoding everyone.



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