![c# - 'IEnumerable<object>' does not contain a definition for 'Add' and no extension method 'Add' accepting a first argument of type 'IEnumerable<object>' - Stack Overflow c# - 'IEnumerable<object>' does not contain a definition for 'Add' and no extension method 'Add' accepting a first argument of type 'IEnumerable<object>' - Stack Overflow](https://i.stack.imgur.com/Xtu1x.jpg)
c# - 'IEnumerable<object>' does not contain a definition for 'Add' and no extension method 'Add' accepting a first argument of type 'IEnumerable<object>' - Stack Overflow
Example with Option with IEnumerable<string> broken - Sequence contains more than one element · Issue #377 · commandlineparser/commandline · GitHub
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