code: func (qb *Builder) AndEquals(tag string, operand interface{}) *Builder {
  	qb.condition.Tag = tag
  	qb.condition.Op = equalString
  	qb.condition.Operand = operandString(operand)
  	return NewBuilder(qb.and(stringIterator(qb.conditionString())))
  }
docs: // Creates the conjunction of Builder and tag = operand