Small update:
Renamed t.instance to t.instanceOf
(less confusing, kept t.instance as an alias for backward compatibility)
Added t.children - allows you to describe an Instance with children
Added t.match - allows you to match a string against a pattern
Added a new optional parameter “childTable” to:
t.instanceOf(className, [childTable])t.instanceIsA(className, [childTable])
If provided, it will be automatically passed into t.children
i.e.:
t.instanceOf("Frame", { Button = t.instanceOf("Button") })
is equivalent to:
t.intersection(t.instanceOf("Frame"), t.children({ Button = t.instanceOf("Button") }))
t.literal now takes multiple values and will union them together for you. So,
t.literal(1, 2, 3)
is equivalent to:
t.union(t.literal(1), t.literal(2), t.literal(3))
Check out the documentation for more info 
