from what i’ve learned from the source code so far:

variables are the most used mutable entities, and they point mostly to 
immutable stuff.
the only weird case is when variables point to other variables.

i don’t believe there is such a thing as mutable ‘class’ fields, except when 
such fields are variables.

.. i may be completely wrong here - but that’s because i’m a newbie.

cheers,
Robert.

On 10 May 2014, at 18:30, David Brown <[email protected]> wrote:

> On Fri, May 09, 2014 at 06:40:37PM -0500, Mark van Gulik wrote:
> 
>> can build an object in which x maps to 5 and y maps to "cheese".  Note
>> that the object is immutable and identityless, just like a map.
> 
> I'm also curious how the mutable fields of classes are implemented.
> 
> David

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