wild-card in Expr to assert all Array-Values

[true-false-maybe]

I have checked the following:

• I've searched existing issues and found nothing related to my issue.

Describe the feature you want to add

I have no idea how hard it would be, but it would be nice to write an assert like this:

Expr	Operator	Value
res.body	isArray
res.body[*]	isString
res.body[*]	isNotEmpty

or in the .bru file:

...

assert {
  res.body: isArray
  res.body[*]: isString
  res.body[*]: isNotEmpty
}

The idea is to check that all values in an array are strings, just with assertions. Or any of the other operators which currently exist.

Responses which would pass would be:

[]
["abc"]
["abc", "def"]

Responses which wouldn't pass would be:

["abc", 123]
[123]
[null]
[{}]

The edge-case when the array is empty should always pass, since one can simply add another assertion that the array is not empty.

Mockups or Images of the feature

For simple arrays:

Expr	Operator	Value
res.body[*]	isString

or in the .bru file:

...

assert {
  res.body[*]: isString
}

Nice-to-have would be further nesting like res.body[*][*] or res.body[*].values[*]

The error message for a fail could be the first value which failed, or something similar.