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Votes

StepModel interface declares isValid prop as type of (optional) boolean only - it needs to allow for null too

In the documentation about validation on steps here it states "By default, the isValid property is null." 

However the type declaration for the isValid property on StepModel doesn't allow for that as it's currently:

    isValid?: boolean

... it needs to be a union of boolean and null instead of just boolean.

I found this issue while writing some code in typescript where I want to clear isValid having set it to true previously - setting isValid to "undefined" gets treated as if it were false so it specifically needs to be set to "null" to clear the validation status and as it stands Typescript complains if you do that because of this issue (I had to use a type assertion on the assignment to override the type to also allow null).