Ideas for built-in types.

[dangle]

typet needs to supply a rich collection of types by default. This issue will track ideas for the initial types.

[dangle]

Create a SingletonObject by creating a private metaclass that inherits from Singleton and _ObjectMeta and a metaclass for a StrictSingletonObject that inherits from Singleton and _StrictObjectMeta.

The proposed use case would be a global settings object:

from typet import SingletonObject, File

class _Configuration(SingletonObject):
    config: File = '~/.my_config'

settings = _Configuration()

[dangle]

• JsonFile
  ** Validates a file's existence and that it can be parsed as JSON.
  ** Instances are dicts.
  ** Sliceable to indicate the type of dict returned.
  ** JsonFile implies JsonFile[dict] by default.
  ** JsonFile[OrderedDict]
• • JsonFile[DefaultDict[Any, Any])
    ** If yaml is installed (optional in setup.py), parse YAML files?

[dangle]

"Registerable" metaclass that registers subclassess automatically.