Ability to mix binary and concise in the same signal for timing diagrams

Question

Hi,

I have a diagram showing SPI waveform. On the MOSI (or MISO) bus, I use concise because I want to show the higher-level view of data words being exchanged. However, between transfers, I want to show the logical state of the line (i.e. low). One solution would be to allow a signal nature to be changed dynamically between concise and binary. Another solution would be to make binary values always available to concise as special values by using {low} or {high}:

@startuml
concise "Web User" as WU

@0
WU is {low}

@100
WU is A1

@200
WU is {-}

@300
WU is {hidden}

@400
WU is A3

@500
WU is {high}
@enduml