This sounds kinda plausible. IIRC, some string implementations have separate implementations for very short strings vs. longer ones. Similar thing for vectors

This sounds kinda plausible. IIRC, some string implementations have separate implementations for very short strings vs. longer ones. Similar thing for vectors. I also see some size-related logic in the (current?) String implementation [0] [1]. String is a class with no virtual methods, and its first data member is a pointer to the underlying buffer [2]. So if Stream.printf unintentionally type-puns String to char*, it might work out okay? [0] https://github.com/arduino/ArduinoCore-API/blob/master/api/String.cpp https://github.com/arduino/ArduinoCore-API/blob/master/api/S... [1] https://github.com/arduino/ArduinoCore-API/blob/master/api/String.h https://github.com/arduino/ArduinoCore-API/blob/master/api/S... [2] https://github.com/arduino/ArduinoCore-API/blob/cb3ab4c90d71d40c9c3f5a37bac0c274e8c89cbb/api/String.h#L220 https://github.com/arduino/ArduinoCore-API/blob/cb3ab4c90d71...