Without the change, it should get any example wrong. This is with native Plan 9, though. Plan9port's fltfmt.c is not the same, so it must be working correctly.
term% cat foo.c
#include <u.h>
#include <libc.h>
void
main(void)
{
print("%.5g\n", 12345.67890);
exits(nil);
}
term% 8.out
12345.7
