test: panic on <
`to_html_with_options("<
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to_html_with_options("<![C&#;", &Options::default())panics in 1.0.0 release atsrc/util/character_reference.rs:83withParseIntError { kind: Empty }. The 4-byte prefix<![Cdispatches as if it were the CDATA-block start sequence (spec requires<![CDATA[), letting an empty&#;reachdecode_numericagainst its documented "never panics" contract (src/util/character_reference.rs:70-76).Verified to fail against
markdown = "=1.0.0"in release. Found via in-tree fuzzing campaign.