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A type alias in this context is where a model is simply another name for a
primitive type, such as `MyString` in the following model definitions:
MyList:
type: array
items:
$ref: '#/definitions/MyString'
MyString:
type: string
It is valid to use a type alias as a property in another object or array model,
even if the object/array is defined before the alias is, as in the example
above. However, the current alias logic only looks "back" in list of previously
defined models, meaning that `MyList` would not know that `MyString` is an
alias. This change fixes the incorrect behavior by pre-calculating the list of
aliases before any models are processed. It also changes the test endpoint to
verify the correct behavior even when an object is defined before an alias it
uses.