text: 'use strict'
  
  const joi = require('joi')
  
  const {config} = global
  const bigNumber = config.math.bignumber
  const regex = new RegExp(bigNumber.regex.decimal.integer.signed)
  
  const schema = joi.string().regex(regex).max(bigNumber.length.integer)
    .description('big-number string for arbitrary-precision arithmetic')
  
  module.exports = schema
  