Commits on Jul 3, 2020

1. Fix empty expanded value for duplicate key …

   Example problematic file:
   
   ```bash
   hello=hi
   greetings=${hello}
   goodbye=bye
   greetings=${goodbye}
   ```
   
   It would result in `greetings` being associated with the empty string
   instead of `"bye"`.
   
   The problem came from the fact that bindings were converted to a dict,
   and so deduplicated by key, before being interpolated.  The dict would
   be `{"hello": "hi", "greetings": "${goodbye}", "goodbye": "bye"}` in the
   earlier example, which shows why interpolation wouldn't work: `goodbye`
   would not be defined when `greetings` was interpolated.
   
   This commit fixes that by passing all values in order, even if there are
   duplicated keys.

   

   bbc2 committed Jul 3, 2020
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