Includes a full implementation of a type-homogeneous Tuple type, using the template types
feature, as a demonstration/check of its operation.
Co-authored-by: Glen Whitney <glen@studioinfinity.org>
Reviewed-on: #45
This should eventually be moved into typed-function itself, but for
now it can be implemented on top of the existing typed-function.
Uses subtypes to define (and error-check) gcd and lcm, which are only
defined for integer arguments.
Resolves#36.
