overloading show for text/plain requires 3-argument version if custom type is an AbstractArray

[ssfrr]

The latest docs for show and friends say:

The default MIME type is MIME"text/plain". There is a fallback definition for text/plain output that calls show with 2 arguments. Therefore, this case should be handled by defining a 2-argument show(stream::IO, x::MyType) method.

However, if MyType subtypes AbstractArray and you define the 2-argument version of show, julia ends up calling this 3-arg definition for AbstractArray instead of your version.

Would it cause problems if the AbstractArray definition used the 2-argument version?

[vtjnash]

the doc update issue is #16763