feat: implement full Unicode support per GraphQL September 2025 spec #1405
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This implements Full Unicode Support as defined in GraphQL specification September 2025 (RFCs absinthe-graphql#805, absinthe-graphql#1040, absinthe-graphql#1053, absinthe-graphql#1142). Changes: - Add support for variable-width Unicode escape sequences (\u{XXXXXX}) allowing representation of all Unicode scalar values up to U+10FFFF - Add validation for Unicode scalar values in escape sequences - Add support for surrogate pair decoding in fixed-width escapes (\uXXXX) for legacy compatibility with supplementary plane characters - Properly reject invalid escape sequences: - Lone high surrogates (U+D800-U+DBFF) - Lone low surrogates (U+DC00-U+DFFF) - Out of range values (>U+10FFFF) - Surrogates in variable-width escapes - Update Parse phase to handle new Unicode escape error type - Add comprehensive test suite covering: - Basic Unicode in strings - BMP escape sequences (\uXXXX) - Extended escape sequences (\u{XXXXXX}) - Surrogate pair handling - Emoji and supplementary plane characters - Invalid escape rejection - Block strings with Unicode - Edge cases The implementation maintains full backward compatibility with existing GraphQL documents while enabling the new Unicode features. Co-Authored-By: Claude Opus 4.5 <[email protected]>
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Summary
\u{XXXXXX}(1-6 hex digits)\uXXXXescapesTest plan
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