Unable to uncheck the checkbox after selection and value is set to an array

[emjaksa]

🐛 Bug report

After updating formik from v2.1.0 to v2.1.2 the checkbox type sets value to an empty array instead of a boolean. As a result you cannot uncheck the checkbox.

Current Behavior

Unable to uncheck the checkbox after selection and value is an array

Expected behavior

Can check and uncheck the checkbox and the form value is a boolean.

Reproducible example

v2.1.0
https://codesandbox.io/s/formik-checkbox-v210-bl4we

v2.1.2
https://codesandbox.io/s/formik-checkbox-v212-7bwh7

Your environment

Software	Version(s)
Formik	2.1.2
React	16.12.0
TypeScript
Browser	Chrome 79.0.3945.130
npm/Yarn
Operating System	OSX

[emjaksa]

Looks like this was resolved in version 2.1.3

[shadowfoxish]

Note: It will still behave this way if you initialize the checkbox value to 1 or 0, so make sure to use true or false

[ScottEnock]

Experiencing the same issue. Can we reopen this please? @emjaksa

[johnrom]

This is fixed in #2255 which will land in v3.