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Chris Tate
ee30477142
readline's emit and EventEmitter's emit copy the listener list before running it, so that listeners added or removed during the emit don't change who runs. The copy was a malloc and a free per emitted event: per line for a readline 'line' listener. A list of at most four listeners is now copied into a stack buffer; longer lists still allocate. A new corpus program pins the snapshot semantics for lists below and above four listeners: a listener added during an emit runs from the next emit, a removed one still runs in that emit, and a once listener runs once.