http.forms

html_unescape(str) -> decoded

Decode HTML entities back to their original characters

Handles three entity forms:

• Named entities: &, <, >, ", '
• Decimal numeric references: &#NNN;
• Hexadecimal numeric references: &#xNNN;

Codepoints above 255 are decoded to UTF-8 via std.utf.char.

One pass decodes each entity once: < gives <, not <. Any other named entity is left as it is.