Clojure ^floats vs. #^floats?

Question

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

In a pull request, someone suggested I use this annotation:

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

which did the trick, but I don't know why the '#' is there. I found this worked, too:

(.put ^floats init-fft-array)

Is there any difference?

Answer 1

#^floats is a legacy syntax, with newer Clojure versions ^floats is preferred.