func (w *WriteBuffer) WriteUint64(n uint64) {
	if b := w.reserve(8); b != nil {
		binary.BigEndian.PutUint64(b, n)
	}
}
func (w *WriteBuffer) WriteUint64(n uint64) {
	if b := w.reserve(8); b != nil {
		binary.BigEndian.PutUint64(b, n)
	}
}
func ( w * WriteBuffer ) WriteUint64 ( n uint64 ) { if b := w . reserve ( 8 ) ; b != nil { binary . BigEndian . PutUint64 ( b , n ) } }
// WriteUint64 writes a big endian uint64 to the buffer
WriteUint64 writes a big endian uint64 to the buffer