aws / aws-sdk-ruby / 1269

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Don't Read IO Objects in Attribute Value Marshal

Resolves Issue #831

Running the following code exercised the problem, and now works with
this change:

```
dynamodb.put_item(
  table_name: "foo",
  item: {
    id: 1,
    contents: StringIO.new("bar")
  }
)
```

The issue appeared to be that #read was called twice on the StringIO or
IO object, and the second call would fail as String#read does not
exist.

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