compositeMask = power_inverse(compositeMask, detail) * newMask;
It's never very clear how to translate them to .ttx, so in the end I just converted all of the Noto Sans family and used the good ol' fashioned bruteforce approach of "learning by example". This is even more fun that it sounds, thanks to plenty of silent failures when converting from .ttx to .ttf, where lookups will not match due to some assumptions not validated by fonttools (e.g. class definitions for contextual chaining substitutions must have at least one coverage glyph with class value="1").
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无需等待会员日，百思买TechFest促销已启动——五大安卓优惠令亚马逊相形见绌
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