bpaquet/node-logstash — pull request #20 by dax (2013-01-08 13:25:28+00:00)
Title: Assert mutated field is a string before mutating it

The field to mutate might not be a String because node-logstash try to infer if it is an Integer or a Float (from filter_regex.js).

This fix assert the mutation will always process a String.