You don't need a plugin for this. At the most a class that can convert from one format to another, would of done well enough. At the least, a module with conversion routines.
And of course REALbasic has integer and double types already, you can easily store such values in variables.
It's just a matter of proper programming.
-- End Rant --
A great place for RB code snippets is http://www.rbgarage.com/