u3: remove unnecessary refcount operations (losing u3_none)#828
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u3k()/u3a_gain()asserts that a noun reference is notu3_none, whileu3z()/u3a_lose()does not. Neither needs -- they will both safely no-op givenu3_none(due to the..._is_normal()conditions inside their implementation functions). The inconsistency here makes for inconsistent code -- the presence ofu3z(u3_none)may indicate misconceived refcount handling.This PR does not resolve the overall issue. It just corrects a couple cases by removing unneeded refcount operations and notes another.