[1.9] Array#pack does not support 'm0' format
---------------------------------------------

                 Key: JRUBY-4741
                 URL: http://jira.codehaus.org/browse/JRUBY-4741
             Project: JRuby
          Issue Type: Improvement
          Components: Core Classes/Modules
    Affects Versions: JRuby 1.5.0.RC1
         Environment: any
            Reporter: Hiroshi Nakamura
         Attachments: 0001-Added-m0-Array-pack-format-in-1.9.patch

{noformat}
0% ruby -e 'p ["\0"].pack("m")' 
"AA==\n"
0% ruby -e 'p ["\0"].pack("m0")' 
"AA==\n"

0% ruby19 -e 'p ["\0"].pack("m")' 
"AA==\n"
0% ruby19 -e 'p ["\0"].pack("m0")'
"AA==" # <<< new pack format >>>

0% bin/jruby -e 'p ["\0"].pack("m")'
"AA==\n"
0% bin/jruby -e 'p ["\0"].pack("m0")'
"AA==\n"

0% bin/jruby --1.9 -e 'p ["\0"].pack("m")'
"AA==\n"
0% bin/jruby --1.9 -e 'p ["\0"].pack("m0")'
"AA==\n" # <<< should be "AA==" (no last LF) >>>
{noformat}

JRUBY-4717 requires this feature.

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