0.4.1

Released: 2018-05-13

Bugfixes

• Struct size couldn't be calculated if the struct contained computed fields or
  had to use the default value for any field.
• Setting the value of a computed or const field would persist until that field
  was deleted. Trying to modify a computed or const field will now trigger a
  ImmutableFieldError.
• Accessing a field as an attribute no longer sets the field to its default
  value if the field hasn't been assigned yet. This made sense before computed
  fields were added, since ostensibly changing one field wouldn't affect any
  others.
• Values assigned to a struct using dictionary notation were not validated.
• len() now throws a MissingRequiredValueError exception if the struct
  size couldn't be computed. UndefinedSizeError is a configuration error and
  in retrospect made no sense to throw there.
• A better error message is shown when accessing a Struct using a field name
  that doesn't exist.
• Attempting to get the value of a field that hasn't been set yet via dictionary
  access used to throw a KeyError even if it was a computed field. Now it
  throws the expected MissingRequiredValueError.

Other Changes

• Dictionary methods on Struct like get, setdefault, etc. are
  deprecated and should not be used anymore. They will be removed in 0.5.0.
• Validator decorators now detect when they're being misused (i.e. called as
  @validator instead of @validator() and throw a helpful exception.
• Bump tested CPython versions to the latest release, i.e. 3.4.7 -> 3.4.8, etc.
• Bump PyPy3.5 5.10 to v6.0