Division or reciprocation.
(/ x) returns the reciprocal of x. It's equivalent to (/ 1.0 x).
With two or more arguments, division is performed sequentially from left to right. Dividing an integer by a float, or vice-versa, produces a float.
The rounding behaviour for negative numbers is equivalent to Rust's / operator -
if you need Euclidean division, use div-euclid instead.
When dividing by zero, if the result would be an integer, it's an error. (It's not an
error to divide by zero when working with floating-point numbers. The result will
be an infinity value: -inf.0 or +inf.0.)