@phpvalueobjects Immutability is not the main characteristic of a VO. It's a tool to make working with them so much easier.

@phpvalueobjects The main characteristic is that they represent a single domain concept as a whole. They're a first level of abstractions.

@mathiasverraes - thanks for these comments. We'd really appreciate a PR if you have the time and energy - github.com/tonypiper/php-…