value is null should not validate

[gaochengyidlmu]

I have the problem.

I want to set some value to null. but it throw an error.

const rule = { transferDate: {type: 'string', required: false, allowEmpty: true}}

let someData = {transferDate: '2018-07-02'}

req.body = {transferDate: null}

{ message: 'should be a string', code: 'invalid', field: 'transferDate' }

[codecov-io]

Codecov Report

Merging #42 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff           @@
##           master     #42   +/-   ##
======================================
  Coverage    99.5%   99.5%           
======================================
  Files           1       1           
  Lines         201     201           
  Branches       73      73           
======================================
  Hits          200     200           
  Misses          1       1

Impacted Files	Coverage Δ
index.js	99.5% <100%> (ø)	:arrow_up:

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[konglingwen94]

这么好的提案，为什么没有通过合并呢。