Falsy values passed into fn as undefined

[gareimer]

this.cache = lazyCache(this, {
    cachedMyProp: {
        params: ["myProp"],
        fn(myProp) {
            // prints undefined
            console.log("myProp: ", myProp);
        }
    }
})

When myProp is 0, null, or "", the value of myProp passed into fn is undefined. It should be the original prop's value.