Registers a flag whose value can be a list of arbitrary floats.

Use the flag on the command line multiple times to place multiple float values into the list. The 'default' may be a single float (which will be converted into a single-element list) or a list of floats.

name str, the flag name.
default Union[Iterable[float], Text, None], the default value of the flag; see DEFINE_multi.
help str, the help message.
lower_bound float, min values of the flag.
upper_bound float, max values of the flag.
flag_values FlagValues, the FlagValues instance with which the flag will be registered. This should almost never need to be overridden.
**args Dictionary with extra keyword args that are passed to the Flag init.

a handle to defined flag.