Possible value assignment issue

[IGI-111]

From the report:

I've a small doubt regarding how to reference variables to each other in sway. I have this code, where I reset the cached valueamount_cached after using it.

    let mut amount_cached = 0u64;
    let mut amount_in_used = if current_amount_in != 0 {
        current_amount_in
    } else {
        let am = amount_cached;
        // reset amount cached after it was used
        amount_cached = 0;
        am
    };

it appears that when trying to reset the amount_cached to zero the value of am also gets reset to 0 , thus always return 0 from the else condition. While assigning the value to am , it seems that it is doing it by reference rather than the value as the following snippet does work correctly where I've added + 0 while assigning value

    let mut amount_in_used = if current_amount_in != 0 {
        current_amount_in
    } else {
        let am = amount_cached + 0;
        // reset amount cached after it was used
        amount_cached = 0;
        am
    };

So, was wondering how can we enforce value assignment without using + 0 ?
here is the link to the github