A YAML way of undefining a value without removing the key

[nitrocode]

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Describe the Feature

There isn't a way to null a value in YAML other than to remove the key by deleting the key or commenting it out.

I'd like to use some kind of null value like <NULL> in atmos YAML without having to remove the key

e.g.

components:
  terraform:
    ecr:
      vars:
        some_input: <NULL>

Expected Behavior

The some_input: <NULL> should omit some_input when the tfvars is generated

Use Case

See above

Describe Ideal Solution

See above

Alternatives Considered

Removing the key or commenting it out

Additional Context

N/A

[aknysh]

some_input: null not working? I think we used it all the time, and null will be set as TF variable values.

[osterman]

I think @nitrocode means a way to not pass a variable, versus passing the variable as null.

[osterman]

I think we could do something using !.

E.g.

some_input: !unset