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Firstly, this is a very useful library! I ran into an issue where I incorrectly parsed a date and passed it into
between()
, which caused an infinite loop since it treated the date similar toundefined
. While we may expect the iterator to be called indefinitely (until we return a falsy result) when we provide a falsy before date, it's likely an error on our part if we pass in anInvalid Date
. I've added a check ininit()
to fail on that along with some tests. I also added two small methods for checking if an object is a date and whether it's valid.