# Common module

This module contains frequently used in FlyForms constants and classes

`flyforms.common.``UNSET`

  Frequently used constant, it is a reflection of unidentified values

`flyforms.common.``jsonify_types`

  Supported types for JSON encoding and decoding operations

`flyforms.common.``is_set`(value)

  Checks is given value is not `UNSET`

class `flyforms.common.``FrozenDict`(*args, **kwargs)

  Immutable dictionary implementation stolen from StackOverflow