[custom values] Parsed as number instead of returning "real" value

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Hello,

First of all, I really like your plugin. Good work!

However, I run into a small issue when using custom values.
I use custom values to display version numbers. For instance, I can have 17.5, 12.2b as well as 20.0.
This is the latter which is giving me problems. The library seems to parse my custom value as number and is returning 20 instead of 20.0, even though I passed a string in the custom array.

Hence when I get the value back in my backend, I can't find 20 in my array...

I made a JSFiddle to illustrate my issue: http://jsfiddle.net/c3fh5qe3/4/

I expected the library to output the custom value exactly as given initially.

What do you think?

Thanks, regard.