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Scan a hash

@example Retrieve the first batch of key/value pairs in a hash
  redis.hscan("hash", 0)

@param [String, Integer] cursor the cursor of the iteration
@param [Hash] options
  - `:match => String`: only return keys matching the pattern
  - `:count => Integer`: return count keys at most per iteration

@return [String, Array<[String, String]>] the next cursor and all found keys
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