Sean O'Halpin

I like #has?

obj.has?(name) would be syntactic sugar for
obj.doodle.attributes.key?(name) where obj can be either a class or an
instance.

I'll include this in t...

document #assigned? and #clear!

document readonly

As you have pointed out, #instance_variable_defined? and #remove_instance_variable do exactly what you want.

However, using them does rely on the underlying imp...

Regarding your other points:

By all means tag a ticket with "feature" to denote a feature request.

I'd welcome any patches - no promises to incorporate them tho...

Use the :readonly option (introduced in version 0.1.9):

require 'doodle'

class Foo < Doodle
  counter = 0
  has :uid, :readonly => true do
    init { counter ...

Apologies for the long delay in replying.

For your use case, I would use #init rather than #default. Something like this:

require 'doodle'

class Foo < Doodle
...

make it easy to define your own visitors

and redo to_hash to use this (rather than current hack with to_yaml)