sakirsensoy / genv / 21395183846

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Fix cache not refreshing when env var is set after initial lookup

When genv.Key() was called before dotenv.Load(), the cache stored
IsDefined: false. Subsequent calls returned the cached value even
after the environment variable was set, causing Bool(), Int(), etc.
to return zero values instead of the actual values.

Now Key() re-checks os.LookupEnv when the cached entry has
IsDefined: false, fixing the issue where dotenv.Load() is called
after genv.Key().

Added test case to prevent regression.

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