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This was introduced in 3467526a65 and the
corresponding RFC gives some reasoning. However the CSPRNG being “not secure
enough” is not a thing and reading these extra bytes is just security theater:
If the CSPRNG would hypothetically be broken, then PHP’s session IDs are the
least of one’s concerns, because we already trust it in `random_bytes()` and
might generate long-term secrets using that.