I spent an evening blaming a quantized 8B model for being dumb. It was classifying support tickets into four labels, and roughly one answer in seven came back as garbage: a double space, a capitalized label, a stray newline, half a word. I tried a bigger quant, a lower temperature, a stricter instruction. Nothing moved. The bug was one character. My prompt template ended with Label: and that final space was fighting BPE tokenization. When I deleted it, 41 bad outputs out of 300 dropped to 3...