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Reject oversized UTF-8 JSON schemas with a validation error and require the xgrammar backend when grammar or JSON constraints are requested. Tokenizer wrappers explicitly expose their underlying HF text tokenizer to validation and inference.
This avoids assertion failures, requests that succeed without enforcing their constraints, and xgrammar type-check failures on wrapped tokenizers. Constraints are never silently dropped.
Tests: schema boundaries, backend validation and real xgrammar compilation with wrapped HF tokenizers (19 passed).