Make sure it works with can-data-types

[matthewp]

You should be able to do:

class Thing extends DefineClass {
  static define = {
    age: types.Number
  }
}

[matthewp]

can-data-types contains some maybe types like MaybeString. We had talked about changing this to something like:

class Person extends DefineClass {
  static define = {
    age: types.strict(Number)
  }
}

How will we do strict types though? Should there be a types.coerce() and types.strict() method on can-data-types?

[matthewp]

Would like your thoughts on the above @justinbmeyer 👆

[matthewp]

Working on this, but blocked on canjs/can-reflect#162 at the moment.

[matthewp]

Not actually blocked by the above.