Is it possible to have a "step change" with an analog value in a timing diagram?

Question

I tried implementing a step change by having two values at the same time, but I couldn't seem to bet what I wanted.  In the example below, I'm trying to get some step changes followed by a "ramp".

analog  "A" between 0 and 100 as A

@A
0 is 50
10 is 50
10 is 0
20 is 0
20 is 10
25 is 10
45 is 90

Comments

I workaround appears to be to slightly offset the times of the step-change;

@startuml

analog  "A" between 0 and 100 as A

@A
0 is 50
10 is 50
10.1 is 0
20 is 0
20.1 is 10
25 is 10
45 is 90

@enduml

---

If I offset the time in the other direction, it seems to "mess up" the diagram scaling.  I'm not sure why:

@startuml

analog  "A" between 0 and 100 as A

@A
0 is 50
9.9 is 50
10 is 0
19.9 is 0
20 is 10
25 is 10
45 is 90

@enduml