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Use String#dup explicitly
fix: stash <pre>s with newline
fix: emoji in <code> should not be converted
<pre>, <code> with attirbutes should be stashed too
fix regression: do not convert @foo when <pre> or <code> exists
Merge pull request #6 from yhara/fix_emoji_in_pre

fix treatments of emoji in pre/code
fix #7: Comment in code block starts new GfmSection