It makes perfect sense if the Lang objective is to fail as little as possible. It picks the left side object, checks if the operand is a valid operand of the type. If it is, it casts the right variable into that type and perform the operand. If it isn’t, it reverses operand positions and tries again.

The issue here is more the fact that + is used both as addition and as concatenation with different data types. Well, not an issue, just some people will complain.