However, when I just try and look up one key, it r...

# announcements

[mkporwit]

However, when I just try and look up one key, it reverts to the deprecated implementation, even if I try and give it a hint that I expect the return to be a Long!

[ilya.gorbunov]

Deprecation doesn't affect the overload resolution rules. The only exception is Deprecated(HIDDEN) which hides the deprecated member completely.