[commands] Allow Converter instances in Greedy. Fix #1939.
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		| @@ -500,8 +500,8 @@ class _Greedy: | ||||
|             raise TypeError('Greedy[...] only takes a single argument') | ||||
|         converter = params[0] | ||||
|  | ||||
|         if not inspect.isclass(converter): | ||||
|             raise TypeError('Greedy[...] expects a type.') | ||||
|         if not inspect.isclass(converter) and not isinstance(converter, Converter): | ||||
|             raise TypeError('Greedy[...] expects a type or a Converter instance.') | ||||
|  | ||||
|         if converter is str or converter is type(None) or converter is _Greedy: | ||||
|             raise TypeError('Greedy[%s] is invalid.' % converter.__name__) | ||||
|   | ||||
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