function latex(strs) {
// ...
}
let doc = latex`
\newcommand{\fun}{\textbf{Fun!}}
\newcommand{\unicode}{\textbf{Unicode!}}
\newcommand{\xerxes}{\textbf{King!}}
Breve over the h goes \u{h}ere
`;
Remove EscapeSequence restriction
for tagged template literals
Illegal EscapeSequences no longer a syntax error
Set cooked values with illegal escape sequences to undefined