About flattening a nullable j.l.Long

[Quân Anh Mai]

Hi,

Currently, I'm having a PR that allows flattening of a nullable value class
with a 64-bit payload [1]. Dan Smith told me that some ideas along these
lines were discussed a few years ago, and the consensus was that it was a
dead end. May I ask what the concerns were, and whether they are still
relevant now?

Thanks a lot,
Quan Anh
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