Server

This is the entry point for all of the code for use within query and mutation functions.

This directory uses an "interface-impl" pattern where:

• The main directory has all interfaces to define the types of the various abstractions. These are parameterized of the developers DataModel type and carefully written to only allow valid usage.
• The impl/ subdirectory has implementations of all of these interfaces. These implementations are sloppier about their types and not parameterized over DataModel. This simplifies their implementation and only gives up a bit of type safety. The DataModel type is built to help developers write correct code, not to check that our internal structures are correct.