There are still some in `Writingmode` class. If the numeric values are not important, they are worth converting to `enum class`. https://searchfox.org/mozilla-central/rev/a3d520fca1a1ca29992cb3806245db25e41a8617/layout/generic/WritingModes.h#158-185
Bug 1610666 Comment 5 Edit History
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There are still some enums in `WritingMode` class. If the numeric values are not important, they are worth converting to `enum class`. https://searchfox.org/mozilla-central/rev/a3d520fca1a1ca29992cb3806245db25e41a8617/layout/generic/WritingModes.h#158-185