A modern programming language that makes developers happier.

kotlinlang

(so were clear, the existing return type is a simple `int`, and it's documented as follows:
&gt;the index of the search key, if it is contained in the list; otherwise, `(-(insertion point) - 1)`. The insertion point is defined as the point at which the key would be inserted into the list: the index of the first element greater than the key, or `list.size()` if all elements in the list are less than the specified key. Note that this guarantees that the return value will be `&gt;= 0` if and only if the key is found.
which is hideous and awful)