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dde11e1757
https://adobe-type-tools.github.io/font-tech-notes/pdfs/5177.Type2.pdf says "The behavior of undefined operators is unspecified." but https://learn.microsoft.com/en-us/typography/opentype/spec/cff2 says "When an unrecognized operator is encountered, it is ignored and the stack is cleared." Some type 0 CIDFontType0C fonts (i.e. CID-keyed non-OpenType CFF fonts) depend on the latter, even though they're governed by the former spec. Fixes rendering of text in 0000521.pdf (e.g. page 10 or 5). The font there has a bunch of 0 opcodes for some reason.