ModelicaStandardLibrary
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Document how UnitDelay currently works.
The current description of UnitDelay has two issues:
- It is plain wrong regarding "second"
- It doesn't document the strong restriction that UnitDelay only works for sampled inputs, this is also the issue in #4451
An alternative is to just correct the model as described in #4451; the downside is that it is not backwards compatible and it introduces additional states.