code: public Datatype.Builder setPartialType(TypeClass partialType) {
      this.partialType = Objects.requireNonNull(partialType);
      _unsetProperties.remove(Property.PARTIAL_TYPE);
      return (Datatype.Builder) this;
    }
docs: Sets the value to be returned by {@link Datatype#getPartialType()}.
  
  @return this {@code Builder} object
  @throws NullPointerException if {@code partialType} is null