Caching tools for use with Pharmacist prescriptions

Tools for implementing data sources

Functions and specs to support construction and processing of data source
results.

Tools for mapping, coercing, and verifying data.

Tools to validate a prescription before attempting to fill it. Pharmacist
will make the best the situation, and in the case of cyclic dependencies and
other forms of invalid states, it will just stop processing. The functions in
this namespace can help you trigger those situations as errors instead.