The serialization spec defines:
def is_active_field(element):
return not is_optional(element) or element is not None
In the specification of StableContainer[N] it’s stated that:
" All fields of a StableContainer[N] MUST be of of type Optional[T]. Such fields can either represent a present value of SSZ type T, or indicate absence of a value (indicated by None). The default valueof an Optional[T] is None."
This makes the first part of is_active_field seem ambiguous - what does is_optional mean? If it means “of type Optional[T]”, this is true for all fields by definition, so do we actually want this?
def is_active_field(element):
return element is not None