It's not being rolled out yet, but I expect it to be deployed by this time next year.
Second attempt 8 days later. Thirty minutes later:
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"Only then can we bring down the cost of future inquiries while protecting access to justice."
PRF is already implemented in WebAuthn Clients and Credential Managers, so the cat is out of the bag. My asks:
if(h->ref || (data_bytes+sizeof(union alloc_header)) > (16LL<<h->bucket)) {