Due to the large amount of connections here, multiplied by the not exactly
small amount of instances even in simple applications, the allocations of
the string operations actually become relevant. Function pointer connects
also allocate, but only about 1/3 of the string-based ones.

One scroll through the KDE Itinerary timeline with a large test data set loaded,
measured in heaptrack. Removed 60k/2.5% (temporary) string allocations.