Niche, if you really need an exclusive method, like... ummm... when you really need non-integer values (floats, doubles - just real numbers) you can simply use this:
($floating_point_variable > minimum && $floating_point_variable < maximum)
while "between?(number_that_your_variable_should_be_greater_than, number_that_your_variable_should_be_lesser_than)" method is just an equivalent for
($some_numeric_value >= n_t_y_v_s_b_g_t && $some_numeric_value <= n_t_y_v_s_b_l_t)
In general, between? just spares some copypastes and keyboard hits. Which is purely awesome, because that's what are all the high-level programming languages about.
I'll let you know as soon as I write the Global Time and Weather CCTS Plugin for RMX-OS. I had quit working on it since another part of tests after the release of the first version turned it out to be an ultimate disaster - I have to understand much more about CCTS.