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Registers a generic Flag object.

Auxiliary function: clients should use the specialized DEFINE_ function instead.

parser ArgumentParser, used to parse the flag arguments.
name str, the flag name.
default The default value of 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.
serializer ArgumentSerializer, the flag serializer instance.
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.
**args dict, the extra keyword args that are passed to Flag init.

a handle to defined flag.