[Yaml-core] unknown value for scalar

[Donnal W. <don...@ya...>]

In the case where it might be desirable to have a key for a scalar
that is currently unknown, is the following illegal?

name:
    first: Donnal
    middle:
    last: Walter

Is this a better way?

name:
    first: Donnal
    middle: ~
    last: Walter


=====
Donnal Walter
Arkansas Children's Hospital

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