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(abstract? (file/temp)) # => true (abstract? (int/s64 1)) # => true (map abstract? [ nil true 97 'a :a "a" ]) # => @[false false false false false false] (map abstract? [ [97] @[97] {0 97} @{0 97} ]) # => @[false false false false] (map abstract? [ even? loop file/open (fn []) ]) # => @[false false false false] (map abstract? [ (file/temp) (fiber/new (fn [])) ]) # => @[true false]