4.4.1
Fixed it's/its errors
Merge pull request #115 from Zearin/patch-1

Fixed it's/its errors
idempotent computed default properties

When a default value or function is provided for a property, state should only
consult the default once.  It should then set the value from the default and
return that value on subsequent calls.

Corrects issues #60
Merge pull request #114 from nathanstitt/retain-default

idempotent computed default properties
4.4.2
Don’t fallback to a datatype default value if setOnce is true.
Merge pull request #118 from AmpersandJS/fix-114-setonce-with-required

Don’t fallback to a datatype default value if setOnce is true. [semi-urgent]
4.4.3
attempt to fix 'setOnce' issues as outlined in #118
4.4.4