Validate and coerce on TypeDef.
Fix boolean coercion.
Tidy constants.
Remove Enum, will use array of strings.
Quote all keys.
Assert on error conditions.
Assert on chunked file write.
Map types for all keys.
0.1.2
Parse byte sizes.
Generate keys from types object.
0.1.3
Capture raw input bytes.

So that CONFIG REWRITE can write the original document and append
modified in-memory values.
Assert on bad enum value.
Assert on document get/set.
Assert on modified keys.
0.1.4
Throw error when attempting to set an unknown key.
Save repeats.
Return string value for enums with arity one.