This will mean that calling DebugString on a MessageLite* which is actually a full Message will get the debug info instead of the minimal output.
PiperOrigin-RevId: 649103508
Besides unnecessary inconsistency on our C symbols, double underscores anywhere in the name are reserved for stdlib use. In practice its unlikely these symbols would ever hit a collision problem (maybe the prior name 'utf8_debug_string' with no prefix as having some risk), but safer to just standardize on this and have no concerns going forward.
PiperOrigin-RevId: 648709299