validParams()The fingerprint covers every slot that repair_params() reads or writes and
every slot that the MizerParams validity function inspects, except for the
values inside the large rate arrays, of which only the dimensions and
dimension names are included. The values in those arrays are checked
unconditionally by check_finite() instead.
validation_key(params)A string.
A MizerParams object.
The fingerprint is always calculated afresh from the current contents of the object, never stored on the object itself, so no change to the object can escape it.