== should add parens for member expr with numeric literal ==
1+ 2 .toString() +3;
1+ 2_000 .toString() +3;
1+ 2..toString() +3;
1+ 2.1.toString() +3;
1+ (2).toString() +3;

[expect]
1 + (2).toString() + 3;
1 + (2_000).toString() + 3;
1 + 2..toString() + 3;
1 + 2.1.toString() + 3;
1 + (2).toString() + 3;