Under the hood
Useful2 Signal1
Working out which editor diagnostics are new got much faster on large files.
What's wrong with this entry?
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What
The tracker that decides which editor diagnostics are new now compares sets of derived keys instead of every field of every pair, turning the comparison from quadratic to linear. The old equality helper is gone.
Evidence
areDiagnosticArraysEqual
Strings lifted out of the shipped bundle, so the claim above can be checked against them.