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- adding ``sort_keys`` support for ``json`` dumpers
- adding conditional ``validate`` boolean flag for ``load_<json,toml,yaml,etc...>`` config method (performs pre-validation of loaded dictionary)
- fixing typecasting of loaded content when var is missing in content, now sets var to None
- improved tests via a hypothesis dynmaic config instance builder
- removing support for `complex <https://docs.python.org/3.8/library/functions.htmlcomplex>`_ vars since no serializers support them