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Daniele Alessandri
ab20c52115
Starting with Redis 3.0.3 the EXISTS command is variadic so that it is
possible to check for the existence of multiple keys in one request,
with the server returning the number of keys found.
This change could break codebases relying on strict comparison (===)
against a boolean value, but just doing $redis->exists('key') == TRUE
is totally fine.