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Easy validation mimicking configobj
Returns two dicts, first with default values (default None)
global_default[consts.CFG_SOMETHING] = consts.CFG_DEF_SOMETHING or None
second with configobj function for value type (default "get" for string, others eg getboolean, getint)
global_function[consts.CFG_SOMETHING] = consts.CFG_FUNC_SOMETHING or get
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