mhart/dynamo-table — pull request #7 by nyergler (2014-05-22 20:05:10+00:00)
Title: Do not use mapping.to for strings.

Some packages (jshint, as an example) inject a `to` method into
`String.prototype`. This causes dynamo-table to attempt to use that
method for mapping.

It doesn't appear that there's any reason for dynamo-table to attempt to
use the `to` method of a String, so just short circuit the check.