Clojure ^ floats against # ^ floats?

Question

What is the difference between ^floats and #^floats in annotations like Clojure?

In a transfer request, someone suggested using this annotation:

 (.put #^floats init-fft-array) 

who did the trick, but I don’t know why the "#" is. I also found this worked:

 (.put ^floats init-fft-array) 

Is there any difference?

Answer 1

#^floats is an obsolete syntax, a more preferable variant of Clojure ^floats .