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The separate Schmitt trigger bit in the configuration is dropped, as the Schmitt trigger is only every disabled when in `GPIO_DISCONNECT` mode. So no need to encode the same information twice. The `gpio_state_t` is improved to be a bitmask that holds the MODER register value and a flag indicating whether open-drain mode should be enabled. Finally, `GPIO_DISCONNECT` is implemented. This is done by placing the GPIO in analog mode, which by disabling the Schmitt trigger reduces power consumption.