Redis hash values store values in one or more fields associated with a single
key name.The value to be stored can be any
serializable R object up to the Redis maximum object size
(excluding, for example, external pointer references).
References to other R objects or environments inside the value are not
guaranteed to be preserved.
In order to store strings that can easily be read by other clients, first
convert the character object using the
charToRaw
function as shown in the
examples.