Function math_script_encode 

pub fn math_script_encode(payload: &str) -> String

Mathematical Script alphabet — uppercase U+1D49C, lowercase U+1D4B6. Script has SIX holes (U+1D49D B, U+1D4A0 E, U+1D4A1 F, U+1D4A3 H, U+1D4A4 I, U+1D4A7 M, U+1D4AD R, U+1D4BA e, U+1D4BC g, U+1D4C4 o) — each filled by the letterlike-symbols block (U+212C BCRIPT CAPITAL B, U+2130 SCRIPT CAPITAL E, etc.) so the encoded string stays NFKC-equivalent to ASCII.