[Zope3-dev] Sum of Decimals

Shane Hathaway shane at hathawaymix.org
Wed Feb 8 11:48:15 EST 2006

Paul Winkler wrote:
> On Wed, Feb 08, 2006 at 11:08:57AM -0500, Stephan Richter wrote:
>>Decimal is a new type and we have not yet declared it to be a rock.
> What is "a rock"?

A rock is an immutable object with no insecure methods.  Trusted code 
can pass a bare rock to untrusted code with no fear that the object will 
be modified or used for breaking out of the security model.  Numbers and 
strings are rocks.


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