On http://clojure.org/reader ...
A shorthand version allows the metadata to be a simple symbol or
keyword, in which case it is
treated as a single entry map with a key of :tag and a value of
the symbol provided, e.g.:
#^String x is the same as #^{:tag String} x
Such tags can be used to convey type information to the compiler.
I'm just wondering, does tag metadata do anything right now? If not,
what is planned for its use?
Thanks in advance.
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