defaults render cwl invalid

[mwalzer]

e.g.

the `param_debug` field is not valid because
                               tried int but
                                 `u'0'` is not int

which is

 - default: '0'
  doc: Sets the debug level
  id: param_debug
  inputBinding:
    prefix: -debug
  label: Sets the debug level
  type:
  - 'null'
  - int

So, the defaults type must match (one of?) the cwl param type defined

[mwalzer]

There is another problem downstream the correction of the type:
Trailing text argument(s) '[false, false, false, false, false, false, false, false, false, false]' given. Aborting!
So, from the perspective of OpenMS tools, which have the defaults built-in, and pass that information on to the ctd file, I am not sure if repeating the defaults in the cwl as defaults is the thing to do. Maybe a doc string would be more robust.
But the abort issue is actually caused by something other than that: flags (parameters without argument) are placed in the cwl associated with (default)values (of their boolean default values in the tool).