I was reading the commons.apache.org
StringUtils.isNumeric("???") = true;
I was able to find the answer to this question by looking at the StringUtils source code for the isNumeric method. In the source code that line appears as:
StringUtils.isNumeric("\u0967\u0968\u0969") = true
Where u0967, u0968, u0969 are Devangari Digits one, two, and three respectively. This may be a browser issue causing the characters to not be rendered correctly in the API.