From: Run Paint Run Run <runrun@...>
Date: 2010-06-06T08:38:41+09:00
Subject: [ruby-core:30606] Re: The `open` Methods and Their Many Arguments

Can I assume that the below is a bug? (I'm being conservative in
opening new tickets because I don't want to clutter the tracker while
the 1.9.2 release is being planned).

>> open('/tmp/bom', mode: ?w){|f| f << "\xEF\xBB\xBFfoo"}
>> [*open('/tmp/bom', encoding: 'BOM|utf-8').read.bytes]
=> [239, 187, 191, 102, 111, 111]
>> [*open('/tmp/bom', mode: 'r:BOM|utf-8').read.bytes]
=> [102, 111, 111]
>> [*open('/tmp/bom', 'r:BOM|utf-8').read.bytes]
=> [102, 111, 111]