Issue #3234 has been updated by Nobuyoshi Nakada.

Category set to ext
Status changed from Open to Assigned
Assigned to set to Aaron Patterson

Psych seems not using complex format, so this error doesn't occur.
But it can't load the data dumped by Syck, too.
I'm not sure where is the primary cause.
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http://redmine.ruby-lang.org/issues/show/3234

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