Add enum support for flags #34
                
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This might be somewhat controversial.
I love the ability to use enums directly when checking things, such as the recent ability to use enums for
authorize(). This adds a similar capability to flagging/unflagging/checking flags on models.The caveat is that
BackedEnumwas introduced in PHP 8.1, which would theoretically be a breaking change here. While it would be ideal to useIlluminate\Support\enum_value, it's marked as@internalfor reasons not immediately clear.Thanks for your consideration!