* Where possible and easy to figure out, change `array` to something like
`array<K,V>` or `V[]` for improved static analysis to catch/prevent
regressions in CI.
* Minor doc improvements:
- consistently use the imperative mood for method briefs,
- consistently use @internal instead of @private,
- explain in @throws why they happen to inform when they should be caught
(and remove if they are not meant to be caught/handled by any caller).
* Simplify addSources() implementation as a simple loop instead recursing
(not worth the complexity, only called once or twice at runtime).
* Use more granular exceptions to distinguish between errors that indicate
a mistake on the caller (logic/invalid arguments error), and runtime
errors (which are more circumstantial).
* Update register() unit test for bad 'moduleInfo' type to use
a nested value, given that the second-parameter level type is
now verified by the signature already.
Change-Id: Id98ba1f28cb7f1c72f0a3e82f4151bcbd0f3db77
a3ce1f9da7