code: func (pop *parsedOpcode) isConditional() bool {
  	switch pop.opcode.value {
  	case OP_IF:
  		return true
  	case OP_NOTIF:
  		return true
  	case OP_ELSE:
  		return true
  	case OP_ENDIF:
  		return true
  	default:
  		return false
  	}
  }
docs: // isConditional returns whether or not the opcode is a conditional opcode which
  // changes the conditional execution stack when executed.