Issue #512 has been updated by Eero Saynatkari.


The potential issue is that String#% _always_ calls #to_ary when available, even if the format string only has one substitution.  In the case of `"%c" % obj`, #to_ary should not be called but for `"%c %s" % obj` it should. Would that be sensible behaviour? 
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http://redmine.ruby-lang.org/issues/show/512

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