parse multi-char numbers consistently in math

crates/typst-syntax/src/parser.rs

@@ -272,6 +272,7 @@ fn math_expr_prec(p: &mut Parser, min_prec: usize, stop: SyntaxKind) {
 
         SyntaxKind::Text | SyntaxKind::MathText | SyntaxKind::MathShorthand => {
             continuable = !p.at(SyntaxKind::MathShorthand)
+                && !p.current_text().chars().all(char::is_numeric)
                 && matches!(
                     math_class(p.current_text()),
                     None | Some(MathClass::Alphabetic)

tests/suite/math/syntax.typ

@@ -28,6 +28,10 @@ $ dot \ dots \ ast \ tilde \ star $
 $floor(phi.alt.)$
 $floor(phi.alt. )$
 
+--- issue-4828-math-number-multi-char ---
+// Numbers should parse the same regardless of number of characters.
+$1/2(x)$ vs. $1/10(x)$
+
 --- math-unclosed ---
 // Error: 1-2 unclosed delimiter
 $a