I'm trying to edit a kubernetes secret using:

kubectl edit secret mysecret -o yaml

And adding a new variable on data:

data:
  NEW_VAR: true

But I receive the error:

cannot restore slice from bool

If I try to use some number, like:

data:
  NEW_VAR: 1

I receive another error after close the editor:

cannot restore slice from int64

What this error means?