[NTG-context] Problem with "fontdata.cache" being set to "no" in font-def.lua

Hi Hans, I am testing comperssion of Chinese punctuations according boundingbox. But I found that the "fontdata.cache" in font-def.lua is set to "no", so I can't get the boundingbox information of those punctuation glyphs in my module. I want to know why set to "no" as default. Is it for efficiency? -- Best regards, Li Yanrui