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Registers a flag whose value can be the name of enum members.

name str, the flag name.
default Enum|str|None, the default value of the flag.
enum_class class, the Enum class with all the possible values for the flag.
help str, the help message.
flag_values FlagValues, the FlagValues instance with which the flag will be registered. This should almost never need to be overridden.
module_name str, the name of the Python module declaring this flag. If not provided, it will be computed using the stack trace of this call.
case_sensitive bool, whether to map strings to members of the enum_class without considering case.
**args dict, the extra keyword args that are passed to Flag init.

a handle to defined flag.