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\watch can now be told to stop after N executions of the query. With the idea that we might want to add more options to \watch in future, this patch generalizes the command's syntax to a list of name=value options, with the interval allowed to omit the name for backwards compatibility. Andrey Borodin, reviewed by Kyotaro Horiguchi, Nathan Bossart, Michael Paquier, Yugo Nagata, and myself Discussion: https://postgr.es/m/CAAhFRxiZ2-n_L1ErMm9AZjgmUK=qS6VHb+0SaMn8sqqbhF7How@mail.gmail.com