If the standard says a message can be up to 4096 bytes long, but for 15 years the message in practice is always under 250 bytes, there are going to be some impl

If the standard says a message can be up to 4096 bytes long, but for 15 years the message in practice is always under 250 bytes, there are going to be some implementations that just use a fixed size buffer smaller than 4096 bytes.