Benchmarking Qwen3.8 27B quantizations: 4-bit holds up, 1-bit collapses

Compare and contrast with tests on Qwen3.6 27B:

* how does quantization hurts pelican-drawing skills (https://quesma.com/blog/qwen-quantization-quality/)

* how does it hurt knowledge (https://quesma.com/blog/quantization-hurts-knowledge/)