moltar/CGI--Uploader — comment on commit 104b82bdd231c9b4f4dea6d81dd17df8d31f6cc6
File:  line 0
By moltar:

Got it:

```
if (exists $map->{$_}) {
```

At this point, the key is already called "id", and therefor not found in the original $map. The if() gets skipped, and "id" gets deleted.