Allow _ in floats

code/demo.odin

@@ -1,13 +1,13 @@
 #import "fmt.odin";
 
 main :: proc() {
-	foo :: proc() -> [dynamic]int {
-		x: [dynamic]int;
-		append(^x, 2, 3, 5, 7);
-		return x;
-	}
+	x: [dynamic]f64;
+	defer free(x);
+	append(^x, 2_000_000.500_000, 3, 5, 7);
 
-	for p in foo() {
-		fmt.println(p);
+	for p, i in x {
+		if i > 0 { fmt.print(", "); }
+		fmt.print(p);
 	}
+	fmt.println();
 }