public final boolean setNA0(int idx) {
    setWrite();
    if( _chk2.setNA_impl(idx) ) return true;
    (_chk2 = inflate_impl(new NewChunk(this))).setNA_impl(idx);
    return true;
  }
public final boolean setNA0 ( int idx ) { setWrite ( ) ; if ( _chk2 . setNA_impl ( idx ) ) return true ; ( _chk2 = inflate_impl ( new NewChunk ( this ) ) ) . setNA_impl ( idx ) ; return true ; }
Set the element in a chunk as missing given a 0-based chunk local index.