Should rm be applied to the output got too?

[eldipa]

Describe the feature you'd like
The rm feature removes a string from the expected output before this is turned into a regex. Should be applied to the output got too?

If an example prints a weird symbol we can remove it. However, if it prints bytes that are invalid in the given encoding, the rm would be too late and this is one of the principal reasons to do this feature.

This should be a backward-compatible change.

Describe alternatives you've considered (optional)
May be we need another option like sanitation to fix any encoding problem?

Additional context (optional)
We need more brainstorming here.