fetch is safe(do not return pointer) and nogc (do not throw exception) variant of "in" but in exchange of the cost of returning value instead of pointer we return ok = true and value if key in map, ok = false otherwise
See Implementation
fetch is safe(do not return pointer) and nogc (do not throw exception) variant of "in" but in exchange of the cost of returning value instead of pointer we return ok = true and value if key in map, ok = false otherwise