Numbers Are Empty
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The project comes with a ton of handy JavaScript utilities including the function. This is great for checking if Arrays, Objects, and Strings are empty. The following is how this function is defined in the docs:
Checks if value is an empty collection or object. A value is considered empty if it's an arguments object, array, string, or jQuery-like collection with a length of 0 or has no own enumerable properties.
Having not examined this definition too closely and because I primarily write Rails code from day to day, I conflated _.isEmpty() with the #blank? method provided by Rails' ActiveSupport. This holds true for the most part, but quickly defies expectations when it comes to numbers.