Feature to get or add value to an associative array.

[Giles Bathgate]

On Tuesday, 17 April 2018 at 19:33:16 UTC, MrSmith wrote:
> You may need to perform extra logic when value is inserted in 
> the container and something else when value already existed.

Fair enough, I will consider adding this and some tests to the 
PR, a function overload seems like the way to go.