code: func WithBlockNum(value uint64) options.Opt {
  	return func(p options.Params) {
  		if setter, ok := p.(fromBlockSetter); ok {
  			setter.SetFromBlock(value)
  		}
  	}
  }
docs: // WithBlockNum specifies the block number from which events are to be received.
  // Note that this option is only valid if SeekType is set to SeekFrom.