Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk> writes:

> Interestingly I think the opposite. On a change parameters should be
> left alone unless they're the thing I'm changing. It's a 'change' to
> an instantiation, *not* an instantiation if you get my drift.

Yes, that is indeed implied in the 'change' verb. However, the tc verb
is 'replace'. If we go with the "leave things alone" paradigm, there
will need to be some way to explicitly specify defaults...

-Toke