Under the hood
Useful2 Signal3
Sessions using the Concise output style are now counted separately from other styles.
What's wrong with this entry?
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What
The list of prompt identities that may be reported gains a key for the new Concise style, alongside the custom, Proactive, Explanatory and Learning keys, so sessions using it are distinguishable instead of collapsing into the generic key.
Evidence
"repl_main_thread:outputStyle:Concise": !0
Strings lifted out of the shipped bundle, so the claim above can be checked against them.