Java standard library retypings.

The lack of standard library retypings is exposed from time to time.
For example, recently I've found the following retypings missing:

?Throwable getCause(Throwable) = native Throwable Throwable.getCause();
?java.io.InputStream getResourceAsStream(ClassLoader, String name) =
  native java.io.InputStream ClassLoader.getResourceAsStream(String);

It seems practical to me to add such retypings into the standart library 
as soon as they are discovered (without looking what other retypings 
might be used for Throwable or ClassLoader). The question is, if it is 
okay to add them in such a way, then where should i place them? Is 
"java.nice" sufficient to keep random dissimilar retypings?


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