More options for deselecting flaky AppDriver values?

[LDSamson]

It would be great to have some more options to select or deselect inconsistent values from AppDriver$expect_values().
What if we could pass a custom function to the input/output/export values?

Something like this:

AppDriver()$expect_values(
  output = \(x){ x[!grepl("flaky_output1", x)] }
)