Support WITHSCORE option in ZRANK, ZREVRANK commands #419
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Problem
Currently, processing accepts the WITHSCORE parameter to ZRANK and ZREVRANK commands, but the result is not built with the score if the parameter is passed in.
Fix
Modified the ZRANK, ZREVRANK implementation to have the ability to provide either a single rank integer output or an array output based on presence of WITHSCORE parameter.