Prevent defining with a string

[matthewp]

This will not be supported at first:

class Thing extends DefineClass {
  static define = {
    age: "number"
  }
}

We should not allow:

• Strings
• Functions
• Integers

[phillipskevin]

We do want to support constructors, right? At least for built-ins like String.

[matthewp]

Yeah maybe. I know we want something like:

class Person extends DefineClass {
  static define = {
    name: types(String)
  }
}

Accepting constructors (functions) would prevent us from having a different meaning of passing a function in the future though.

[matthewp]

Will do this after #3

[matthewp]

Will it be confusing if we support:

class Person extends DefineClass {
  static define = {
    name: String
  }
}

But not:

class Thing extends DefineClass {
  static define = {
    prop: MyCustomClass
  }
}

? To me that is slightly confusing

[matthewp]

This is done in #50. Strings are now default values like other primitives.