The 'ov' crate provides a collection of traits that allow you to chain off of anything. Each trait has a single method with the same name as the trait (but in snake case).
Over, OverRef, and OverMut
are each of self, &self, and &mut self, and the callback receives that same value.
They are implemented for all types.
OverDeref and OverDerefMut are implemented
for types which have Deref and DerefMut implementations. They both borrow the receiver,
and pass a reference of the Deref::target to the callback.
```rust use ov::*; let mut n = 5; asserteq!(n.over(|n| n * 2), 10); n.overmut(|n| { *n *= 3 }); assert_eq!(n, 15);
let s = String::from("Hello, world!");
// Note: this would fail if s is String or &String
let len = s.overderef(|s| str::len(s));
asserteq!(len, 13);
```