What is the signature for map_entry ?
From the 2025 Q1 Newsletter:
map_entry
builtin #
A new builtin to help in cases where you want to lookup if something exists in a map, return a pointer to the value or insert something new + return the final pointer in the map
Here is an example of it being used in the core:strings
intern library. This is a call which has to be efficient as it may get called many times.