V4 generateMessage not working

[matzeso]

Versions

• vee-validate: 4.0.0.-alpha.11
• vue: 3.0.0-rc.10

Describe the bug
When using rules that return false, the generateMessage function from config should make sure to put the correct message in the error bag. Instead, the error is false (as if generateMessage was never declared).

To reproduce
Steps to reproduce the behavior:

1. Go to https://codesandbox.io/s/vee-validation-v4-generator-y7v7i?file=/src/main.js
2. Type anything into text field
3. See "false" printed

Expected behavior
The demo code taken from https://vee-validate.logaretm.com/v4/guide/i18n#global-message-generator says that by configuring generateMessage with a custom message, it would show that message instead.

Demo link
https://codesandbox.io/s/vee-validation-v4-generator-y7v7i?file=/src/main.js

I really like your work on v4 so far, keep up the great work :-)

[logaretm]

The first line of the docs says:

This guide is only concerned with generating error messages for globally defined validators

Your rule isn't globally defined, it's a local function. That means that error generation should be done on your part.

Not sure if this is expected or not, but I will consider invoking the global message handler if the function didn't return a string.