Should tags be de-duplicated?

[joshed-io]

Metka Version: Latest

What did you do?

I saved a model with two tags in the same array.

model.tags = ["github", "github"]

What did you expect to happen?

Upon saving, model.tags would contain just one item github.

What actually happened?

model.tags contained github twice.

I'm not sure if this the expected behavior or not. Opening an issue to discuss if metka should do this or the user.