CustomNone

CustomNone is a programming concept used to differentiate between a parameter that has not been set and one that is explicitly set to None. In languages like Python, None often indicates "no value." However, sometimes you need to know if a user intentionally provided None or simply didn't specify a value. CustomNone acts as a unique placeholder—it's a distinct object that signals "no value provided" without ambiguity, allowing functions to accurately detect whether a parameter was omitted or intentionally set to None.