OverLoad: local variables do not override environment variables

[5nord]

When using override functions like OverLoad local variables do not override environment variables anymore, since #12.

Example 1

$ export A="fromEnv"
$ cat .env
A="fromFile"
B="$A"

Expected Behaviour

After using OverLoad, variable B should have value fromFile.

Actual Behaviour

Variable B has value fromEnv.

Example 2: Recursive variable expansion

$ export B="fromEnv"
$ cat .env
A="$B$C"
B="fromFile"
C="fnord"

What is the expected behaviour, when a reference is resolved before its definition? I would argue it should be fromEnv,
since gotenv evaluates environment files line by line.