Support plan

• which support plan is this issue covered by?: Community
• is this issue currently blocking your project?: No
• is this issue affecting a production system?: No

Context

• node version: 12.14.0
• module version with issue: 16.1.8
• last module version without issue: 14.3.1 (the one I use but not last)
• environment (e.g. node, browser, native): node
• used with (e.g. hapi application, another framework, standalone, ...): standalone
• any other relevant information:

What are you trying to achieve or the steps to reproduce?

const someStringSchema = Joi.string().valid(['someValue'])

What was the result you got?

An error message as expected because of moving from array args to list of args BUT
The error message is wrong: Method no longer accepts array arguments: allow

What result did you expect?

I imagine we want Joi to warn us about the valid method not allow (that had the same issue earlier)
Method no longer accepts array arguments: valid