Commits on Nov 15, 2020

1. Fix pypy environment in Travis CI

   

   bbc2 committed Nov 15, 2020
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2. Decouple variable parsing and expansion …

   This is now done in two steps:
   
   - Parse the value into a sequence of atoms (literal of variable).
   - Resolve that sequence into a string.

   

   bbc2 committed Nov 15, 2020
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3. Fix variable expansion order without override …

   This fixes an issue when a variable is resolved differently in two
   bindings.
   
   For instance, take the following env file:
   
   ```
   PORT=8000
   URL=http://localhost:${PORT}
   ```
   
   With `PORT` set to `1234` in the environment, the environment resulting
   from `dotenv_load(override=False)` would be:
   
   ```
   PORT=1234
   URL=http://localhost:8000
   ```
   
   This was inconsistent and is fixed by this commit.  The environment
   would now be:
   
   ```
   PORT=1234
   URL=http://localhost:1234
   ```
   
   with override, and
   
   ```
   PORT=8000
   URL=http://localhost:8000
   ```
   
   without override.
   
   The behavior of `load_dotenv` is unchanged and always assumes
   `override=True`.

   

   bbc2 committed Nov 15, 2020
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