strongOrElse
Creates and returns a new Provider that returns a fallback value if the value of this is null.
Creates and returns a new Provider that returns a fallback value obtained through provider if the value of this is null.
If provider is null, returns this. If provider is not null, creates and returns a new Provider that returns a fallback value obtained through provider if the value of this is null.
Creates a new MutableProvider that returns a fallback value if the value of this is null. Conversely, if the returned provider's value is set a value equal to value, the value of this will be set to null.