(config)(config keys)(config keys default)Read a value from the configuration file at keys (keys is a
path of keys as used in get-in). There are two arities.
If the file does not exist, throws a FileNotFoundException.
If a value at keys does exist, returns it.
If a value at keys does not exist and no default is given (single
argument), throws an exception.
If a value at keys does not exist and a default is given,
returns the default.
Read a value from the configuration file at `keys` (`keys` is a path of keys as used in `get-in`). There are two arities. If the file does not exist, throws a FileNotFoundException. If a value at `keys` does exist, returns it. If a value at `keys` does not exist and no `default` is given (single argument), throws an exception. If a value at `keys` does not exist and a `default` is given, returns the default.
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