[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.

Shane


More information about the Zope3-dev mailing list