Number-string addition always puts the string first

[bbrk24]

For the following program:

G'DAY MATE!

GIMME 5 + "foo";
GIMME "foo" + 5;
GIMME "" + 5 + "foo";

CHEERS C***!

I would expect this output:

5foo
foo5
5foo

However, the actual output is:

foo5
foo5
5foo

[bigyihsuan]

I think have found the exact line:

aussieplusplus/src/runtime/interpreter.rs

Line 422 in 9522366

(a, Value::String(b)) => Ok(Value::String(b.add(a.to_string().as_str()))),

This line does b: str + a: any instead of a: any + b: str.