This function causes the pattern search to be performed against an object's values instead of its names
pattern for which to match against an objects values
In order to perform a reverse lookup, values must be converted to character names.
a string object with the
reversse.lookup attribute set.
When performing a reverse lookup, values (not names) are searched. The corresponding names are returned. NOTE: this is highly experimental and only works for atomic vectors. It is uncertain how this might be applied to recursive structures like lists.
What happens if there are two reverse.lookups
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