Sometimes, good news sneaks into our world undetected. Big int as a separate data type has been available in Dataverse for about two years now.
Tip #1460: Loops and ThisRecord in low-code plug-ins
When you use loops like ForAll function in a low-code plug-in, ThisRecord will change its meaning from the table row associated with the plug-in run, to the row inside the loop. Disambiguating is fairly straightforward… once you know how.