Fixed a bug where it would get the wrong extreme values for data that ha...

If your data is passed in via strings the comparator would fail on a comparison similar to "72.6" > "321.4"

This would distort the graph and give you the incorrect extremes. 
According to the docs in datahandler/datahandler.js, ```series``` is in the "unified data format", specifically "!Array.<[!number,?number,?]>", which I take to mean that the y value being a string is invalid and is a misconfiguration. How do you get into that state? Are you using native format?