Add option to define __dict__ on Struct type
#331
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This adds a new `dict` option on a `Struct` type, disabled by default. Enabling this will add a lazily-allocated `__dict__` attribute to all instances of that type, which can be used to store additional runtime state. Note that any data stored in the `__dict__` is _not_ encoded/decoded/pickled/copied by default. One use of this is to support `functools.cached_property` on `Struct` instances, since this decorator stores the cached value on the instance `__dict__`.
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This adds a new
dictoption on aStructtype, disabled by default. Enabling this will add a lazily-allocated__dict__attribute to all instances of that type, which can be used to store additional runtime state. Note that any data stored in the__dict__is not encoded/decoded/pickled/copied by default.One use of this is to support
functools.cached_propertyonStructinstances, since this decorator stores the cached value on the instance__dict__.Fixes #324, fixes #204.