Custom type representation

[tantaman]

These should be Str_of or Blob_of.

Execution decorators can deserialize the result and lift T?

[tantaman]

SQLite lets users declare custom types in their create table statements.

CREATE TABLE foo (
  id TEXT PRIMARY KEY,
  b MyCustomType,
  c MyOtherCustomType
);

We could parse these out and map them to actual typescript types. Doing this would require some runtime layer to convert columns to the correct types.

Python bindings have explored this: https://docs.python.org/3/library/sqlite3.html#sqlite3-converters