Inconsistency in parsing timestamps for search_after

Hello,
I've been fighting with pagination using search_after for dates that might be undefined.
When I sort in ascending order and the date is undefined I receive in sort property value 9223372036854775807, which I can pass as string to search_after (I have to do because of Javascript number precision issue) and receive next chunk of hits.
But when I reverse the order, I'll get -9223372036854775808 in response, which I can only pass as number not string because of parsing issue.

Why is that I can pass negative timestamp as number but not as string? How to workaround this?
Thanks for advance for tips.

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