myrrha

https://github.com/blambeau/myrrha

Myrrha provides the coercion framework which is missing to Ruby. Coercions are simply defined as a set of rules for converting values from source to target domains (in an abstract sense). As a typical and useful example, it comes with a coerce() method providing a unique entry point for converting a string to a numeric, a boolean, a date, a time, an URI, and so on.