Fix RestrictedYAMLTree allowing the Symbol class should allow all symbols #617
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…bols Ref: ruby#495 That's how it works for `safe_load`: ```ruby >> YAML.safe_load(':foo', permitted_classes: [Symbol]) => :foo ``` So `safe_dump` should mirror that.
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Ref: #495
That's how it works for
safe_load:So
safe_dumpshould mirror that.cc @tenderlove