Provides the infrastructure to allow annotating the return types of functions, and does so for essentially every operation in the system (the only known exceptions being add, multiply, etc., on arbitrarily many arguments).
One main infrastructure enhancements are bounded template types, e.g. `T:number` being a template parameter where T can take on the type `number` or any subtype thereof.
A main internal enhancement is that base template types are no longer added to the typed universe; rather, there is a secondary, "meta" typed universe where they live. The primary point/purpose of this change is then the necessary search order for implementations can be much better modeled by typed-function's search order, using the `onMismatch` facility to redirect the search from fully instantiated implementations to the generic catchall implementations for each template (these catchalls live in the meta universe).
Numerous other small improvements and bugfixes were encountered along the way.
Co-authored-by: Glen Whitney <glen@studioinfinity.org>
Reviewed-on: #53
Inspired by https://github.com/josdejong/mathjs/discussions/2212 and
https://github.com/josdejong/mathjs/issues/2585.
Provides a simple adapter function `adapted` which takes a class
implementing an arithmetical datatype and returns a PocomathInstance
with a new type for that class, invoking the methods of the class
in a standard way for the Pocomath/mathjs operations. (That instance
can then be installed in another to add the new type to any instance
you like, including the default one.)
Uses this facility to bring fraction.js Fraction into Pocomath, and
tests the resulting type.
Currently the "standard" interface for an arithmetical type is heavily modeled
after the design of fraction.js, but with experience with other 3rd-party types
it could be streamlined to something pretty generic (and the Fraction
adaptation could be patched to conform to the resulting "standard"). Or a
proposal along the lines of https://github.com/josdejong/mathjs/discussions/2212
could be adopted, and a shim could be added to fraction.js to conform to
**that** standard.
Resolves#30.
