Single-dollar $...$ inline math collided with currency text ($50,
US$ 680, "$50M to $72M"), parsing money as math and corrupting it.
Drop single-dollar inline math; keep $$...$$ display math and add
\(...\) inline and \[...\] display via marked tokenizers (caught at
lex time so they survive backslash escaping and stay code-safe).
Also gate renderMathExpressions on a cheap $-presence check so the
split + regex passes are skipped for the non-math majority of blocks.
Bohdan Triapitsyn
a99eba1ca6