Wrong parameter type for some at.session.Session calls

[MikAtCosesy]

The at.session.Session class has helper methods to do different at commands.
They are: action, read, test, and set.
Each of these helper methods create a corresponding at.session.Command object. The at.session.Command objects take a Duration as an input parameter, but the helper classes take a Duration? as a parameter and passes it along without a null check. This can lead to a type-check failure at runtime.
The erroneous code:

class Command:
...
  timeout/Duration

  constructor.action .name --.timeout=DEFAULT_TIMEOUT:
    type = ACTION_
...
class Session:
...
  /**
  Executes an `action` command with the $command_name.
  */
  action command_name/string --timeout/Duration?=null -> Result:
    return send
      Command.action command_name --timeout=timeout
...

[kasperl]

Can you show us a stack trace from where this goes wrong and maybe the SDK version where you see this? It is okay to pass null as an argument to a method with a non-nullable parameter if it has a default value.