Semantics of RMT with TX idle disabled.

[kolban]

The Remote control peripheral technology (RMT) has the option of setting a transmission idle level. What I take this to mean is that if I am not actively transmitting a sequence, the GPIO pin will rise or fall to the specified level. However, I notice that the idle level appears to be an optional attribute ... meaning that we have to explicitly enable the use of idle level setting. If I do not explicitly set the idle level to be enabled, what might that say about the actual output state of a GPIO pin when not actively transmitting? Is it open collector? Does it float? Does it have the last signal value set on it from an item?