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builder: a .glyphs source without customParameters is not variable - #1230
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File.is_variable indexed the font-level customParameters list, which a single-master .glyphs file need not have, so the fontc path (which asks every source whether it is variable) crashed with KeyError. Treat a missing list as empty. Assisted by an AI agent (Claude Opus 5.5)
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File.is_variableindexed the font-levelcustomParameterslist, which a single-master .glyphs file need not have, so the fontc path (which asks every source whether it is variable) crashed withKeyError. Treat a missing list as empty.This is needed by googlefonts/fontc_crater#100
Assisted by an AI agent (Claude Opus 5.5)