Changed header encoding from toHexString() to toString() #28
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We started noticing some NumberFormatExceptions showing up in our local development after pulling the changes from #26. Digging into it, it looks like we have some weirdness in Java to thank for that. Looking at the definition of Long.toHexString(), it makes an assumption that the long value provided is nonnegative, which isn't something we can guarantee. When a negative number is provided, the resulting encoded hex is generates too large of a number when parsed by Long.parseLong(). Instead, it seems like we should use an overload of Long.toString(), specifying the radix of 16. I've updated a test to cover this corner case.