Immutability Changes Everything Pat Helland Salesforce.com One Market Street, #300 San Francisco, CA 94105 USA 01(415) 546-5881 phelland@salesforce.com ABSTRACT There is an inexorable trend towards storing and sending immutable data. We need immutability to coordinate at a distance and we can afford immutability, as storage gets cheaper. This paper is simply an amuse-bouche on the repeated pattern