imatrix A/B — arctic-embed-l-v2 (cstr/arctic-embed-l-v2-GGUF), cos vs full-precision gold, n=5, calib=10
q8_0    imatrix=0  cos_vs_f16=0.999170    609.7MB  -> (A/B only)
q4_k    imatrix=0  cos_vs_f16=0.939479    458.7MB  -> (A/B only)
q4_k    imatrix=1  cos_vs_f16=0.948155    458.7MB  -> arctic-embed-l-v2-q4_k-imatrix.gguf
iq4_xs  imatrix=1  cos_vs_f16=0.967070    449.2MB  -> arctic-embed-l-v2-iq4_xs.gguf