I'm sorry, I thought there might've been some confusion re. actual sigint definition based on some deeper history and ASCII codes (which didn't seem like it from cursory search)
> ctrl-shift-C will send SIGINT
You filter against your terminal app, where Ctrl+Shift+C will continue send Ctrl+Shift+C
Though it's also possible to fix it everywhere - use a keyboard rebinding tool to make Ctrl-Shift-C send Ctrl-C key combo instead