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YamlEmitter only routed a string into YamlEscaper when it held a character below 0x20, so 0x7F, the C1 block, U+2028 and U+2029 went out as plain scalars. They are not `c-printable` (YAML 1.2 spec 5.1), and NEL, LS and PS are line breaks in YAML 1.1, so the rendered document is either rejected or silently split by a reader. The escapes added in #1165 for 0x85, 0xA0, U+2028, and U+2029 could only fire when some other character happened to open that gate. Share one predicate between the two sites that decide, and give 0x7F-0x9F the 8-bit escape they lack.
Core implementation of the Pkl language. Includes Java APIs for embedding the language into JVM applications, and for building libraries and tools on top of the language.