Ecto.Changeset.validate_length/3

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Validates a change is a string of the given length.

## Examples

    validate_length(changeset, :title, 3..100)
    validate_length(changeset, :title, min: 3)
    validate_length(changeset, :title, max: 100)
    validate_length(changeset, :code, is: 9)
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