mapbox/geojson.io — pull request #303 by jwass (2013-12-24 03:36:45+00:00)
Title: Fix the numeric check on property values

Fixes cases where '1 main street' would be parsed as a number and treated
as nan. The solution comes from
http://stackoverflow.com/questions/18082/validate-numbers-in-javascript-isnumeric/1830844#1830844

Fixes #299